src: Capitalize Windows per-user install path

Use the new capitalization of the per-user install path, even though
Windows is generally case-insensitive for filenames/paths,
and in theory/in testing it doesn't matter. I'm just playing it safe.

src/apm.coffee

@@ -53,7 +53,7 @@ module.exports =
         asarPath = '/opt/Pulsar/resources/app.asar'
         return process.nextTick -> callback(asarPath)
       when 'win32'
-        asarPath = "/Users/#{process.env.USERNAME}/AppData/Local/Programs/pulsar/resources/app.asar"
+        asarPath = "/Users/#{process.env.USERNAME}/AppData/Local/Programs/Pulsar/resources/app.asar"
         unless fs.existsSync(asarPath)
           asarPath = "/Program Files/Pulsar/resources/app.asar"
         return process.nextTick -> callback(asarPath)