fixes tslint warning (#21469)

Author: TravCav

Gulpfile.ts

@@ -1115,7 +1115,7 @@ gulp.task("lint", "Runs tslint on the compiler sources. Optional arguments are:
     const fileMatcher = cmdLineOptions.files;
     const files = fileMatcher
         ? `src/**/${fileMatcher}`
-        : "Gulpfile.ts 'scripts/generateLocalizedDiagnosticMessages.ts' 'scripts/tslint/**/*.ts' 'src/**/*.ts' --exclude 'src/lib/*.d.ts'";
+        : `Gulpfile.ts "scripts/generateLocalizedDiagnosticMessages.ts" "scripts/tslint/**/*.ts" "src/**/*.ts" --exclude "src/lib/*.d.ts"`;
     const cmd = `node node_modules/tslint/bin/tslint ${files} --formatters-dir ./built/local/tslint/formatters --format autolinkableStylish`;
     console.log("Linting: " + cmd);
     child_process.execSync(cmd, { stdio: [0, 1, 2] });