Revert finalizing GodotHost#getCommandLine() public API

[m4gr3d]

Fix API regression issue reported in GodotVR/godot_openxr_vendors#264

[m4gr3d]

@dsnopek Note that I'm keeping the update to DeviceUtils#isNativeXRDevice(context: Context) given the recency of the api, so we'll still need to do one update for the vendors plugin.

[dsnopek]

@m4gr3d This still leaves the return type of getCommandLine() changing from MutableList<String> to ArrayList<String>. Do we want that?

If our goal is that we don't want Android plugins written for Godot 4.3 to require source changes to compile, then we should probably revert the change to the return type as well.

[dsnopek]

When building godot_openxr_vendors against these changes, I'm also getting an error about MissingSuperCall that I had to @Suppress(...) which would be another source change.

UPDATE: You can see all the changes needed to godot_openxr_vendors in PR GodotVR/godot_openxr_vendors#266

[m4gr3d]

@dsnopek I've addressed your feedback!

[dsnopek]

Thanks! The latest version works great in my testing

[akien-mga]

Thanks!