Fix CancelPending crashing when caller is self#542
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This fixes the crash outlined in this VDC article https://developer.valvesoftware.com/wiki/Logic_relay
Some TF2 maps have non-logic_relay entities erroneously fire this input on themselves, which was previously left unhandled. Since Mapbase added CancelPending to the base entity class, it always handles the input and leads to a double-free crash
Does this PR close any issues?
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