Unset electric border after interactive move

AbstractClient::setQuickTileMode() no longer updates electric border
mode, which can leave AbstractClient::electricBorderMode() with an old
value at the next interactive move and potentially result in quick
tiling not work if the user decides to untile and then tile the window
again while still holding left button.

src/abstract_client.cpp

@@ -1021,6 +1021,7 @@ void AbstractClient::finishInteractiveMoveResize(bool cancel)
         setQuickTileMode(electricBorderMode());
         setElectricBorderMaximizing(false);
     }
+    setElectricBorderMode(QuickTileMode(QuickTileFlag::None));
 
     Q_EMIT clientFinishUserMovedResized(this);
 }