GHA: Fix xargs command

`--replace` checks for any `{}` as we need to get the order of the
arguments right.
This is however incompatible with `--maxargs/-n` which is ignored and
hence not neccessary.
Remove that to avoid the warning.

Author: Flamefire

.github/workflows/sanity_check.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Sort files
         run: |
           absPotFile="$PWD/rttr.pot"
-          find -name '*.po' -print0 | xargs -n1 -0 --replace \
+          find -name '*.po' -print0 | xargs -0 --replace \
             msgmerge --sort-output --no-wrap --quiet --update --backup=none {} ${absPotFile}
       - name: Check diff
         run: |