MediaTypePicker - removed unused label

The "Add" label doesn't do anything here,
there are no slots in `umb-input-media-type`,
and that component controls its own label.

src/Umbraco.Web.UI.Client/src/packages/media/media-types/property-editors/media-type-picker/property-editor-ui-media-type-picker.element.ts

@@ -40,7 +40,6 @@ export class UmbPropertyEditorUIMediaTypePickerElement extends UmbLitElement imp
 				.value=${this.value ?? ''}
 				.min=${this._limitMin ?? 0}
 				.max=${this._limitMax ?? Infinity}>
-				<umb-localize key="general_add">Add</umb-localize>
 			</umb-input-media-type>
 		`;
 	}