Move card path to egl struct, use egl struct for monitor enumeration

include/capture/kms_vaapi.h

@@ -12,7 +12,6 @@ typedef struct {
     gsr_egl *egl;
     const char *display_to_capture; /* if this is "screen", then the first monitor is captured. A copy is made of this */
     gsr_gpu_info gpu_inf;
-    const char *card_path; /* reference */
     bool wayland;
     bool hdr;
     gsr_color_range color_range;