admin parametres: hr separator between current/new password, drop new-password top border

app/public/assets/css/admin.css

@@ -1369,6 +1369,13 @@ th.admin-ap-col {
 	border-top: none;
 }
 
+/* Separator between the current and new password inputs */
+.param-form .param-password-separator {
+	border: 0;
+	border-top: 1px solid var(--border-primary);
+	margin: 0;
+}
+
 .param-form fieldset {
   display: flex;
   flex-direction: column;