luci-base: standards compliant dropdown fix for mobile keyboards

Signed-off-by: TGSAN <[email protected]>

Author: TGSAN

modules/luci-base/htdocs/luci-static/resources/ui.js

@@ -1092,6 +1092,7 @@ const UIDropdown = UIElement.extend(/** @lends LuCI.ui.Dropdown.prototype */ {
 				'maxlength': this.options.maxlength,
 				'placeholder': this.options.custom_placeholder ?? this.options.placeholder,
 				'inputmode': 'text',
+				'enterkeyhint': 'done'
 			});
 
 			if (this.options.datatype || this.options.validate)