Added tint color to chatBox buttons
Added tint color to chatBox buttons

abhaymaniyar/zulip-android,vishwesh3/zulip-android,zulip/zulip-android,prati0100/zulip-android,Sam1301/zulip-android,abhaymaniyar/zulip-android,Sam1301/zulip-android,prati0100/zulip-android