Qt: Correct typo "QtCtreator" to "QtCreator"

Qt.gitignore

@@ -35,9 +35,9 @@ target_wrapper.*
 # QtCreator
 *.autosave
 
-# QtCtreator Qml
+# QtCreator Qml
 *.qmlproject.user
 *.qmlproject.user.*
 
-# QtCtreator CMake
+# QtCreator CMake
 CMakeLists.txt.user*