fix edge case with {}'s in logs

[jdodds]

Proposed Changes

This fixes an edge case where it's possible for writeMessage to try to send a string to String.Format that looks like it still has format specifiers in it when there are none.

I haven't yet been able reproduce this with a toplevel test without reproducing the app I'm working ons environment, but here's a stack trace:

System.FormatException: Input string was not in a correct format.
   at System.Text.StringBuilder.FormatError()
   at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ParamsArray args)                                                                                              
   at System.String.FormatHelper(IFormatProvider provider, String format, ParamsArray args)
   at System.String.Format(IFormatProvider provider, String format, Object[] args)
   at A.B.Logging.Providers.ConsoleProvider.ConsoleProvider.writeMessage[a](a name, LogLevel logLevel, FSharpOption`1 messageFunc, FSharpOption`1 exception, Object[] formatParams) in /Users/jeremiahdodds/workspace/my/project/paket-files/TheAngryByrd/FsLibLog/src/FsLibLog/FsLibLog.fs:line 463
   at A.B.Logging.Providers.ConsoleProvider.A-B-Logging-Types-ILogProvider-GetLogger@487.Invoke(LogLevel logLevel, FSharpOption`1 messageFunc, FSharpOption`1 exception, Object[] formatParams) in /Users/jeremiahdodds/workspace/my/project/paket-files/TheAngryByrd/FsLibLog/src/FsLibLog/FsLibLog.fs:line 487                                                                                      
   at A.B.Logging.Types.Inner.ILog.fromLog(ILog logger, Log log) in /Users/jeremiahdodds/workspace/my/project/paket-files/TheAngryByrd/FsLibLog/src/FsLibLog/FsLibLog.fs:line 86                 
   at A.B.Logging.Types.Inner.ILog.error'(ILog logger, FSharpFunc`2 logConfig) in /Users/jeremiahdodds/workspace/my/project/paket-files/TheAngryByrd/FsLibLog/src/FsLibLog/FsLibLog.fs:line 126  
   at A.B.Logging.Types.Inner.ILog.error(ILog logger, FSharpFunc`2 logConfig) in /Users/jeremiahdodds/workspace/my/project/paket-files/TheAngryByrd/FsLibLog/src/FsLibLog/FsLibLog.fs:line 140   
   at <redacted>
   at FSharp.Control.Tasks.TaskBuilder.tryWith[a](FSharpFunc`2 step, FSharpFunc`2 catch)

The fix itself also might be done in a better way than two string replacements :/

Types of changes

What types of changes does your code introduce to FsLibLog?
Put an x in the boxes that apply

• [x ] Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• Build and tests pass locally
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Further comments

Tested via fsi calling String.Format on values as they appeared at runtime when I was seeing the error.

[TheAngryByrd]

Thanks!