refact: flutter keyboard, map mode (#9160)

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/models/desktop_render_texture.dart

@@ -181,6 +181,7 @@ class TextureModel {
   }
 
   updateCurrentDisplay(int curDisplay) {
+    if (isWeb) return;
     final ffi = parent.target;
     if (ffi == null) return;
     tryCreateTexture(int idx) {