global mixin for icons not being applied

[bhoriuchi]

The following lines are missing in the compiled code for gritcode/vuestrap-icons making it not possible to specify custom sprites when using the compiled versions.

          if (this.$options.vuestrapIconsPath) {
            return this.path = this.$options.vuestrapIconsPath;
          }

see https://github.com/gritcode/gritcode-components/blob/master/dist/gritcode-components-bundle.js#L1057