fixed config sync host URL

tabby-settings/src/components/configSyncSettingsTab.component.pug

@@ -15,7 +15,7 @@ ul.nav-tabs(ngbNav, #nav='ngbNav')
                         (ngModelChange)='config.save()',
                     )
                     .input-group-append(*ngIf='config.store.configSync.host')
-                        button.btn.btn-secondary((click)='platform.openExternal("http://" + config.store.configSync.host)')
+                        button.btn.btn-secondary((click)='openSyncHost()')
                             i.fas.fa-external-link-alt
 
             .form-line

tabby-settings/src/components/configSyncSettingsTab.component.ts

@@ -106,4 +106,12 @@ export class ConfigSyncSettingsTabComponent extends BaseComponent {
     isActiveConfig (c: Config) {
         return c.id === this.config.store.configSync.configID
     }
+
+    openSyncHost () {
+        if (this.config.store.configSync.host === 'https://api.tabby.sh') {
+            this.platform.openExternal('https://tabby.sh/app')
+        } else {
+            this.platform.openExternal(this.config.store.configSync.host)
+        }
+    }
 }