Fix Chapel version query (#1823)

In version 1.28 and prior, the `chplVersion` string is prefixed
with "version", but that has been removed since, so this string
split was resulting in an empty array, meaning that the index
into the array was out of bounds.

This PR just does a replace on the string for "version ", so it
works both for the old string that contained "version " and the
new string that does not.

src/ServerConfig.chpl

@@ -83,9 +83,9 @@ module ServerConfig
      */
     proc getChplVersion() throws {
         use Version;
-        var ver = chplVersion:string;
-        var verArray = ver.split('version');
-        return verArray[1];
+        // Prior to 1.28, chplVersion had a prepended version that has
+        // since been removed
+        return (chplVersion:string).replace('version ', '');
     }
 
     /*