remove unused style to improve lint score

src/main/res/values/styles.xml

@@ -254,6 +254,4 @@
 	</style>
 	<style name="NextcloudTextAppearanceMedium" parent="style/TextAppearance.AppCompat.Medium">
 	</style>
-	<style name="NextcloudTextAppearanceSmall" parent="style/TextAppearance.AppCompat.Small">
-	</style>
 </resources>