[5.4] Update repeatable-table.php (joomla#46287)

* Update repeatable-table.php

The <th> width was hardcoded to 45%, regardless of the number of columns.
This change makes it dynamic, distributing the width according to the number of fields, while reserving 8% for the action column.

Author: nordmograph

layouts/joomla/form/field/subform/repeatable-table.php

@@ -60,8 +60,10 @@
 
     $sublayout = 'section-byfieldsets';
 } else {
-    foreach ($tmpl->getGroup('') as $field) {
-        $table_head .= '<th scope="col" style="width:45%">' . strip_tags($field->label);
+    $fields = $tmpl->getGroup('');
+    $th_width = 92 / count($fields);
+    foreach ($fields as $field) {
+        $table_head .= '<th scope="col" style="width:' . $th_width . '%">' . strip_tags($field->label);
 
         if ($field->description) {
             $table_head .= '<span class="icon-info-circle" aria-hidden="true" tabindex="0"></span><div role="tooltip" id="tip-' . $field->id . '">' . Text::_($field->description) . '</div>';