Make select2 container width 100% in admin forms layout

Adjusted the styles for the Select2 container to ensure it spans the full width within the admin forms. This improves layout consistency and resolves display issues for page selector dropdowns.

assets/css/admin/forms.css

@@ -65,6 +65,9 @@
   margin: 0 0 5px 0;
   display: inline-block;
 }
+.um-form-table.um-top-label .um-forms-line td select.um-forms-field.um-pages-select2 ~ .select2-container {
+  width: 100% !important;
+}
 .um-form-table.um-top-label .um-forms-line[data-field_type=icon] td label {
   width: 100%;
   display: block;

assets/css/admin/forms.sass

@@ -85,6 +85,9 @@
           margin: 0 0 5px 0
           display: inline-block
           //font-weight: bold
+        select.#{$prefix}forms-field.#{$prefix}pages-select2
+          & ~ .select2-container
+            width: 100% !important
 
       &[data-field_type="icon"]
         td