hostapd: fix patch offset

Fixes the offset of the patch added in 93bbd998aa
  ("hostapd: enter DFS state if no available channel is found").

Signed-off-by: Leon M. George <leon@georgemail.eu>

package/network/services/hostapd/patches/800-dfs-enter-DFS-state-if-no-available-channel-is-found.patch

@@ -17,7 +17,7 @@ Signed-off-by: David Bauer <mail@david-bauer.net>
 
 --- a/src/ap/dfs.c
 +++ b/src/ap/dfs.c
-@@ -1066,8 +1066,15 @@ static int hostapd_dfs_start_channel_swi
+@@ -1086,8 +1086,15 @@ static int hostapd_dfs_start_channel_swi
  						  &oper_centr_freq_seg0_idx,
  						  &oper_centr_freq_seg1_idx,
  						  &skip_radar);