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FloatableElement: Don't try unbinding events before we bind them

Description

FloatableElement: Don't try unbinding events before we bind them

Follow-up to c76fd3dd407d064aae97d483bd09dbe8c193a93d. This code path
can execute before we set up the events, and thus before
this.$floatableWindow is set, causing (mostly harmless) exceptions.

Change-Id: I4a74f2c7ccc8bf79adace975757807ff2e2e54f1