ci: update mpv.com path again

Hopefully for the last time. It will now be in ./build as one would
expect.

ci/build-mingw64.sh

@@ -280,7 +280,7 @@ meson compile -C $build
 if [ "$2" = pack ]; then
     mkdir -p artifact/tmp
     echo "Copying:"
-    cp -pv $build/player/mpv.com $build/mpv.exe artifact/
+    cp -pv $build/mpv.com $build/mpv.exe artifact/
     # copy everything we can get our hands on
     cp -p "$prefix_dir/bin/"*.dll artifact/tmp/
     shopt -s nullglob

ci/build-msys2.sh

@@ -35,5 +35,4 @@ meson setup build            \
   -D uchardet=enabled        \
   -D vapoursynth=enabled
 meson compile -C build
-cp ./build/player/mpv.com ./build
 ./build/mpv.com -v --no-config