QtLockedFile: Delete lock file on unlock

Change-Id: I78b887c961730e1d6cbc097f57f0a3ac97ec7c0e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/shared/qtlockedfile/qtlockedfile_unix.cpp

@@ -95,6 +95,7 @@ bool QtLockedFile::unlock()
     }
 
     m_lock_mode = NoLock;
+    remove();
     return true;
 }
 

src/shared/qtlockedfile/qtlockedfile_win.cpp

@@ -167,6 +167,7 @@ bool QtLockedFile::unlock()
     }
 
     m_lock_mode = QtLockedFile::NoLock;
+    remove();
     return true;
 }