Fix for blame shortcut
Fix for blame shortcut

Simple `b` is overriden by v+b in DiffView, but b:keydown is different
as 'b' in iron-a11-keys-behavior.

This is temporary simple fix, before we reimplement shortcut
implementations to enable special keys like g+, v+ to not override
other shortcuts

Change-Id: Iaf95cac3a90a941465dde6d8a13cfc82be52cf9f

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