Optimize: clash install use short url if exists

src/views/Subconverter.vue

@@ -6,6 +6,7 @@
           <div slot="header">
             Subscription Converter
             <svg-icon icon-class="github" style="margin-left: 20px" @click="goToProject" />
+            <i class="el-icon-s-promotion" />
 
             <div style="display: inline-block; position:absolute; right: 20px">{{ backendVersion }}</div>
           </div>
@@ -366,7 +367,7 @@ export default {
       }
 
       const url = "clash://install-config?url=";
-      window.open(url + encodeURIComponent(this.customSubUrl));
+      window.open(url + encodeURIComponent(this.curtomShortSubUrl !== '' ? this.curtomShortSubUrl : this.customSubUrl));
     },
     surgeInstall() {
       if (this.customSubUrl === "") {