hello xr: change the ViewConfigurationType

[jypeitao]

Change the ViewConfigurationType which app expected but runtime not supported to the one the runtime prefers the application to use.

[rpavlik-bot]

An issue (number 2258) has been filed to correspond to this pull request in the internal Khronos GitLab (Khronos members only: KHR:openxr/openxr#2258 ), to facilitate working group processes.

This GitHub pull request will continue to be the main site of discussion.

[rpavlik]

I think ideally we'd just have it as a command line option. In this case, the app is flexible enough to support just about any view config, but this is intended to be a two-step interaction in general: app gets the runtime preferences, and chooses the first one on the runtime's list that is also on the app's "known supported" list.

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