Replace Twitter with Mastodon

[ArnyminerZ]

ICSx5 still has the Twitter link. Replace with Mastodon (https://fosstodon.org/@davx5app)

icsx5/app/src/main/java/at/bitfire/icsdroid/ui/InfoActivity.kt

Lines 114 to 119 in a884ff6

	IconButton({ showTwitter() }) {
	Icon(
	painter = painterResource(R.drawable.twitter_white),
	contentDescription = stringResource(R.string.app_info_web_site)
	)
	}