Ninja: Extract identical code from condition

Source/cmLocalNinjaGenerator.cxx

@@ -492,10 +492,8 @@ std::string cmLocalNinjaGenerator::MakeCustomLauncher(
     if (ccg.GetWorkingDirectory().empty()) {
       output =
         this->ConvertToRelativePath(this->GetCurrentBinaryDirectory(), output);
-      output = this->ConvertToOutputFormat(output, cmOutputConverter::SHELL);
-    } else {
-      output = this->ConvertToOutputFormat(output, cmOutputConverter::SHELL);
     }
+    output = this->ConvertToOutputFormat(output, cmOutputConverter::SHELL);
   }
   vars.Output = output.c_str();