Use flatpak-spawn in flatpak

TODO

@@ -45,3 +45,5 @@ Better colors for vaapi. It looks a bit off when recording vscode for example.
 
 Clear vaapi surface (for focused window).
 Support -h and --help. -h should only show the first line and --help the full help. On error, only show that -h.
+
+Handle rotated monitor (on nvfbc and kms).

src/kms/kms_client.c

@@ -142,10 +142,10 @@ int gsr_kms_client_init(gsr_kms_client *self, const char *card_path, const char
             const char *args[] = { server_filepath, self->socket_path, NULL };
             execvp(args[0], (char *const*)args);
         } else if(inside_flatpak) {
-            const char *args[] = { "pkexec", server_filepath, self->socket_path, NULL };
+            const char *args[] = { "flatpak-spawn", "--host", "pkexec", server_filepath, self->socket_path, NULL };
             execvp(args[0], (char *const*)args);
         } else {
-            const char *args[] = { "flatpak-spawn", "--host", "pkexec", server_filepath, self->socket_path, NULL };
+            const char *args[] = { "pkexec", server_filepath, self->socket_path, NULL };
             execvp(args[0], (char *const*)args);
         }
         perror("execvp");