Fixed an issue with animated icons on fancylineedit

Using a static local here is obviously simply wrong.
This should take care of the remaining issues with broken
animation states.

Reviewed-by: danimo

src/libs/utils/fancylineedit.h

@@ -114,6 +114,7 @@ private:
     bool isSideStored() const;
 
     FancyLineEditPrivate *m_d;
+    QString m_oldText;
 };
 
 } // namespace Utils