Fixed theme options

Prop needed to be persisted

lnbits/core/templates/admin/_tab_theme.html

@@ -66,7 +66,7 @@
             v-model="formData.lnbits_theme_options"
             multiple
             hint="Choose themes available for users"
-            :options="settings.lnbits_theme_options"
+            :options="lnbits_theme_options"
             label="Themes"
           ></q-select>
           <br />

lnbits/core/templates/admin/index.html

@@ -140,6 +140,16 @@
     data: function () {
       return {
         settings: {},
+        lnbits_theme_options: [
+            'classic',
+            'bitcoin',
+            'flamingo',
+            'freedom',
+            'mint',
+            'autumn',
+            'monochrome',
+            'salvador'
+          ],
         formData: {},
         formAddAdmin: '',
         formAddUser: '',