android_surface: declare transformation_matrix earlier in ngli_android_surface_new()
android_surface: declare transformation_matrix earlier in ngli_android_surface_new()

Avoids a potential uninitialized use of transformation matrix in case of
error.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl