renderer/native: Choose first EGL config for non-GBM backends
Commit 712ec30c added the logic to only choose EGL configs that match the GBM_FORMAT_XRGB8888 pixel format. However, there won't be any EGL config satisfying such criteria for non-GBM backends, such as EGLStreams.
This change will let us choose the first EGL config for non-GBM backends, while still forcing GBM_FORMAT_XRGB8888 configs for the GBM one.
Related to: #2 (closed)
Reviewers: @jadahl
Edited by Miguel A Vico Moya