Use /usr/bin/gsr-kms-server constant path for pkexec

include/capture/kms_vaapi.h

@@ -10,7 +10,6 @@ typedef struct _XDisplay Display;
 typedef struct {
     Display *dpy;
     const char *display_to_capture; /* if this is "screen", then the entire x11 screen is captured (all displays). A copy is made of this */
-    const char *program_dir; /* ref */
 } gsr_capture_kms_vaapi_params;
 
 gsr_capture* gsr_capture_kms_vaapi_create(const gsr_capture_kms_vaapi_params *params);