gluon-core: fix channel_width selection (#3806)

mode:match("%d+") returns a string while site.wifi{24,5}.channel_width()
returns a number, so "width == channel_width" is never true. Every radio
falls through to last_width, which is also compared as a string, making
"80" sort above "160".

The configured channel width is therefore ignored and radios come up at
the widest available mode capped at 80 MHz - including the VHT160 case
that e734119 set out to fix.

Fixes: e734119 ("gluon-core: fix potentially too low channel_bandwidth")

Author: drkhsh

package/gluon-core/luasrc/lib/gluon/upgrade/200-wireless

@@ -100,7 +100,7 @@ local function get_htmode(radio)
 	for mode, available in pairs(iwinfo.nl80211.htmodelist(phy)) do
 		if available then
 			local hwmode = mode:match("%a+")
-			local width = mode:match("%d+")
+			local width = tonumber(mode:match("%d+"))
 
 			if hwmode .. width == mode and hwmode == htmode then
 				if width == channel_width then