SCI: FPFP: Act 2 error when walking up stairs after restaurant

[sluicebox]

ScummVM throws an error when walking up the hotel stairs after entering the restaurant in act 2:

tried to cmdSendMidi on non midi slot (0001:211a)!

To reproduce with attached save of PC Floppy at the start of Act 2:

1. Walk left and enter the restaurant
2. Leave the restaurant, walk around back, and go upstairs

This is due to the game script attempting to mute/unmute a Sound object with kDoSound SendMidi while the sound object is not a midi sound. The object, gameMusic2, is set to the sample of people talking in the restaurant. All versions of FPFP do this and there is there is another script which also mutes/unmutes this way.

[sluicebox]

​https://github.com/scummvm/scummvm/pull/1604

[Filippos Karapetis <bluegr@…>]

In 7862140:

SCI: Change sendMidiCommand non-midi error to warn

FPFP calls kDoSound SendMidi on non-midi sounds. Fixes bug #10952