Fix firebug flag

cmd/wails/4_build.go

@@ -73,7 +73,6 @@ func init() {
 		// Project options
 		projectOptions := &cmd.ProjectOptions{}
 		projectOptions.Verbose = verbose
-		projectOptions.UseFirebug = usefirebug
 
 		// Check we are in project directory
 		// Check project.json loads correctly
@@ -83,6 +82,9 @@ func init() {
 			return fmt.Errorf("Unable to find 'project.json'. Please check you are in a Wails project directory")
 		}
 
+		// Set firebug flag
+		projectOptions.UseFirebug = usefirebug
+
 		// Check that this platform is supported
 		if !projectOptions.PlatformSupported() {
 			logger.Yellow("WARNING: This project is unsupported on %s - it probably won't work!\n         Valid platforms: %s\n", runtime.GOOS, strings.Join(projectOptions.Platforms, ", "))