Patch attached to prevent items from ever reaching a maximum durability lower
than one through unsuccessful repairs.

This patch doesn't do any other things than just moving the check out of the
second if-branch where it would not be performed on the highest item repair
skill level.

It is now called unconditionally immediately after the durability modification
of the repair. If this initial modification has set the new maximum durability
to a value lower than one, it is reset to one.