Include generate-licenses into bundle-mac script (#22800)

Closes https://github.com/zed-industries/zed/issues/21613

Same as `bundle-linux`, to avoid panicking on missing licenses for
homegrown-built releases when `Help -> View dependency licenses` menu
action is triggered.

Release Notes:

- Altered bundle-mac script to generate licenses

script/bundle-mac

@@ -84,6 +84,9 @@ version_info=$(rustc --version --verbose)
 host_line=$(echo "$version_info" | grep host)
 local_target_triple=${host_line#*: }
 
+# Generate the licenses first, so they can be baked into the binaries
+script/generate-licenses
+
 if [ "$local_arch" = true ]; then
     echo "Building for local target only."
     cargo build ${build_flag} --package zed --package cli --package remote_server