FancyLineEdit: Fix initial value of m_firstChange

Gone wrong in 1f8b9077ab.

Change-Id: I76147b36a7fc8ff5cbf8129481d1d32a52c3a7b5
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/libs/utils/fancylineedit.cpp

@@ -101,7 +101,7 @@ public:
     bool m_iconEnabled[2];
 
     bool m_isFiltering = false;
-    bool m_firstChange = false;
+    bool m_firstChange = true;
 
     QString m_lastFilterText;