Fix -Wdeprecated-enum-enum-conversion
Even though zwp_text_input_v2_content_hint and QtWaylandServer::zwp_text_input_v2::content_hint represent the same values, they are not the same from the compiler perspective.
Even though zwp_text_input_v2_content_hint and QtWaylandServer::zwp_text_input_v2::content_hint represent the same values, they are not the same from the compiler perspective.