Multiblock-enabled modules not saving into multiblock table correctly. Enabled, not Enbabled!

There's a typo in the code for inserting an entry into the {multiblock} table. $block_instance->mb_enabled is mistyped as $block_instance->mb_enbabled, which, though hilarious, does not actually insert the correct value into the table.

Attached patch fixes the problem, although you could also fix the problem in about 2 seconds with any text editor.