meson: drop spurious 3rd positional argument to gnome.compile_resources
Otherwise build with meson 0.61 fails with:
data/meson.build:85:0: ERROR: gnome.compile_resources takes exactly 2 arguments, but got 3.
Otherwise build with meson 0.61 fails with:
data/meson.build:85:0: ERROR: gnome.compile_resources takes exactly 2 arguments, but got 3.