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alsa-ucm: Disable old modifiers when switching profiles of same verb

Alper Nebi Yasak requested to merge alpernebbi/pulseaudio:alsa-ucm-fix-disabling-modifiers into master

Looks like I forgot to disable modifiers when switching between profiles of the same verb, this is to fix that. I discovered the issue shortly after my code got merged, with a weird UCM config that caused a segfault when switching profiles.

For example, when we have a Speaker-Mic conflict and a PlayTone modifier with a PlaybackPCM value that has SupportedDevice of just Speaker. This gives us two profiles: Speaker (with PlayTone as another mapping), and Mic (without). When switching from Speaker to Mic we get a segfault because we try to disable PlayTone's map->ucm_context.ucm_device which is null.

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