Fix missing initializer of auto completer

Change-Id: I38580087c1d8e3419698371970d0e6f9188d284d
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/texteditor/basetexteditor.cpp

@@ -189,6 +189,7 @@ class BaseTextEditorPrivate
 {
 public:
     BaseTextEditorPrivate()
+        : m_autoCompleter(new AutoCompleter)
     {}
 
     // Note: This is always a copy of IContext::m_widget.