ColorPicker: add immediate watcher for currentColor (#13278)

packages/color-picker/src/components/picker-dropdown.vue

@@ -109,8 +109,11 @@
         }
       },
 
-      currentColor(val) {
-        this.customInput = val;
+      currentColor: {
+        immediate: true,
+        handler(val) {
+          this.customInput = val;
+        }
       }
     }
   };

packages/color-picker/src/main.vue

@@ -165,6 +165,7 @@
         enableAlpha: this.showAlpha,
         format: this.colorFormat
       });
+
       return {
         color,
         showPicker: false,