Action Map Editor fixes and improvements

Multiple fixes:
* Fixed device not being updated correctly (changing the device dropdown did not actually change the underlying event's device)
* Device selection now defaults to `All Devices`
* Device is now displayed in the text shown in the input event editor, and in the action list.
* There was code running twice previously because of the following interaction: 1) input via "Listen for Input" tab. 2) `_set_event` gets called. 3) input list tree selection gets updated to match the listened event. 4) tree "item_selection" signal is emitted. 5) eventually `_set_event` is called again.
* The only reason this was not an infinite loop is because reselection is disabled on the tree. So, the code runs twice - not a big deal, but it is unnecessary processing and it could cause an issue in the future. If someone turns on reselection on the tree, the whole thing comes crashing down. This should prevent that scenario and make the code a bit safer and more robust.

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