[kwin] updateXTime before establishing grab for move resize mode

Grabbing the pointer failed causing unrestricted move resize to
operate incorrectly (position didn't update).

geometry.cpp

@@ -2561,6 +2561,7 @@ bool Client::startMoveResize()
     m_moveResizeGrabWindow.create(r, XCB_WINDOW_CLASS_INPUT_ONLY, 0, NULL, rootWindow());
     m_moveResizeGrabWindow.map();
     m_moveResizeGrabWindow.raise();
+    updateXTime();
     const xcb_grab_pointer_cookie_t cookie = xcb_grab_pointer_unchecked(connection(), false, m_moveResizeGrabWindow,
         XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION |
         XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_LEAVE_WINDOW,