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tablet: Check if client is supported before sending tool button

Ash Blake requested to merge (removed):tablet_tool_button_client_support_check into master

KWin did not check tool->isClientSupported() before calling tool->sendButton(). Because of this, it could crash with a segfault in wl_resource_post_event if resource was null.

This solves 438010 - kwin crashes when clicking on MPV with a pen.

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