Fix __include_inline__() input trimming

Previously this would trim whitespace inside the arg call:

	__include_inline__('   i-get-trimmed   ');
	__include_inline__(   '   i-dont-get-included   '   );

But now instead will allow whitespace _outside_ the quote marks:

	__include_inline__(   '   i-get-included-but-not-trimmed   '   );

src/lib/templated-js.js

@@ -2,7 +2,7 @@ const fs = require('../lib/sync-fs');
 
 const fromFile = (projectDir, rootFile) => fromString(projectDir, fs.read(rootFile));
 const fromString = (projectDir, rootText) =>
-    rootText.replace(/__include_inline__\('\s*([^_]*)'\s*\);/g, (_, includedFile) =>
+    rootText.replace(/__include_inline__\(\s*'([^']*)'\s*\);/g, (_, includedFile) =>
         fs.read(`${projectDir}/${includedFile}`));
 
 module.exports = { fromFile, fromString };