Add support for default colored title bar (#667)

Co-authored-by: Lea Anthony <lea.anthony@gmail.com>

config.go

@@ -181,7 +181,7 @@ func newConfig(userConfig *AppConfig) (*AppConfig, error) {
 		MaxWidth:  -1,
 		MaxHeight: -1,
 		Title:     "My Wails App",
-		Colour:    "#FFF", // White by default
+		Colour:    "", 
 		HTML:      defaultHTML,
 	}
 

lib/renderer/webview.go

@@ -115,9 +115,12 @@ func (w *WebView) Initialise(config interfaces.AppConfig, ipc interfaces.IPCMana
 	// SignalManager.OnExit(w.Exit)
 	
 	// Set colour
-	err := w.SetColour(config.GetColour())
-	if err != nil {
-		return err
+	color := config.GetColour()
+	if color != "" {
+		err := w.SetColour(color)
+		if err != nil {
+			return err
+		}
 	}
 
 	w.log.Info("Initialised")