ar71xx: fix typo in network defaults

Commit 9fec39a (ar71xx: add support for TP-Link TL-WA855RE v1) introduced a
typo in 02_network, fix it by removing the stray paren.

Reported-by: Henryk Heisig <[email protected]>
Signed-off-by: Jo-Philipp Wich <[email protected]>

target/linux/ar71xx/base-files/etc/board.d/02_network

@@ -116,7 +116,7 @@ ar71xx_setup_interfaces()
 	tl-wa830re-v2|\
 	tl-wa850re|\
 	tl-wa850re-v2|\
-	tl-wa855re-v1)|\
+	tl-wa855re-v1|\
 	tl-wa901nd|\
 	tl-wa901nd-v2|\
 	tl-wa901nd-v3|\