Fix filename sanitization with command line option

When enabling the command line option the file name added to the runner
did not escape the slashes on windows in the same way other paths where
sanitized. Copied the sanitization from the other filename uses.

Author: JonHHenneberg

auto/generate_test_runner.rb

@@ -389,7 +389,7 @@ def create_main(output, filename, tests, used_mocks)
       output.puts('  {')
       output.puts('    if (parse_status < 0)')
       output.puts('    {')
-      output.puts("      UnityPrint(\"#{filename.gsub('.c', '')}.\");")
+      output.puts("      UnityPrint(\"#{filename.gsub('.c', '').gsub(/\\/, '\\\\\\')}.\");")
       output.puts('      UNITY_PRINT_EOL();')
       tests.each do |test|
         if (!@options[:use_param_tests]) || test[:args].nil? || test[:args].empty?