flatpak: Disable obs-browser build

CI/flatpak/com.obsproject.Studio.json

@@ -231,7 +231,8 @@
         "-DUSE_XDG=ON",
         "-DDISABLE_ALSA=ON",
         "-DENABLE_PULSEAUDIO=ON",
-        "-DWITH_RTMPS=ON"
+        "-DWITH_RTMPS=ON",
+        "-DBUILD_BROWSER=OFF"
       ],
       "sources": [
         {