Fix Fedora 44 build: suppress -Werror=sfinae-incomplete for GCC 16+ (#6843)

Qt MOC and protobuf forward declarations trigger this warning in GCC 16.
  Re-enable Fedora 44 CI build now that it compiles successfully.

.github/workflows/desktop-build.yml

@@ -138,7 +138,6 @@ jobs:
           - distro: Fedora
             version: 44
             package: RPM
-            test: skip   # This is failing to build, currently. To be fixed.
 
           - distro: Ubuntu
             version: 22.04