hostapd: Always enable 80 MHz channel width for 802.11ac

This is mandatory to support by all hardware and works well.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

html/cgi-bin/wlanap.cgi

@@ -600,6 +600,8 @@ ieee80211n=1
 wmm_enabled=1
 ht_capab=$wlanapsettings{'HTCAPS'}
 vht_capab=$wlanapsettings{'VHTCAPS'}
+vht_oper_chwidth=1
+vht_oper_centr_freq_seg0_idx=42
 END
 ;