This commit fixes an issue where if your controller was currently on a
bank not near the first few tracks, and you then deleted tracks, the
controller bank buttons would appear unresponsive because of the
"if (initial >= sorted.size())" check in switch_banks().
This would occur when the difference between the _initial_bank and
whatever sorted.size() returns was greater than or equal to strip_cnt.
For example, if your _initial_bank was 48, your strip_cnt was 24 and you
had 24 tracks after the deletion, then the above conditional would evaluate
to true and exit out of switch_banks BEFORE actually switching the bank,
effectively stranding the controller unless you added enough tracks back.
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