Use the correct class name for config window

src/catpaw_config.h

@@ -19,5 +19,5 @@ public:
     void save() override;
 
 private:
-    KWin::Ui_MouseClickEffectConfigForm m_ui;
+    Ui::CatPawEffectConfigForm m_ui;
 };

src/catpaw_config.ui

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>KWin::MouseClickEffectConfigForm</class>
+ <class>CatPawEffectConfigForm</class>
  <widget class="QWidget" name="KWin::MouseClickEffectConfigForm">
   <property name="geometry">
    <rect>