macdeploy: rename macOS output to bitcoin-macos-app.zip

We were naming this "Bitcoin-Core.zip", just to immediately rename it.
Similar to what we do with Windows, i.e `bitcoin-win64-setup.exe`.

contrib/guix/libexec/build.sh

@@ -369,7 +369,7 @@ mkdir -p "$DISTSRC"
             ;;
         *darwin*)
             cmake --build build --target deploy ${V:+--verbose}
-            mv build/dist/Bitcoin-Core.zip "${OUTDIR}/${DISTNAME}-${HOST}-unsigned.zip"
+            mv build/dist/bitcoin-macos-app.zip "${OUTDIR}/${DISTNAME}-${HOST}-unsigned.zip"
             mkdir -p "unsigned-app-${HOST}"
             cp  --target-directory="unsigned-app-${HOST}" \
                 contrib/macdeploy/detached-sig-create.sh