zplugin: Limit an influence on the FPATH contents – preserve colons
zplugin: Limit an influence on the FPATH contents – preserve colons

In reaction to:
https://github.com/zdharma/zplugin/commit/ecf0bf3e59e30d13d204d0a76a6b377fd2524fdc#commitcomment-31833883

psprint/zplugin,psprint/zplugin,psprint/zplugin