Fix breaking rebar blocks doesn't damage the tool

[balugaq]

No description provided.

[balugaq]

As the picture shows, when player breaks a block, it calls ServerPlayerGameMode.destoryBlock and callEvent (L352) and the event is handled by BlockListener, goes to BlockStorage.removeBlock, then set the block to air (PlayerBreak
doesn't override shouldSetToAir so returns true by default), causing the failure of the check at ServerPlayerGameMode (L372).
Normally the block is not air, and goes to the else branch, then calls mineBlock (L401) to damage the tool.

So add a override to fix this problem.

*tested