[reMarkable] Don't need to keep attempting WiFi connection after success (#7121)

If we're in range of multiple known WiFi Access Points (including multiple instances of the same SSID), we don't need to keep trying to connect after the first successful connection.

Minimal change would have been replacing the return inside the foreach function with return [a non-nil value].
But foreach is deprecated, and since I was touching the code anyhow, I figured I'd do that tiny update as well.

frontend/ui/network/manager.lua

@@ -594,8 +594,7 @@ function NetworkMgr:reconnectOrShowNetworkMenu(complete_callback)
         table.sort(network_list,
            function(l, r) return l.signal_quality > r.signal_quality end)
         local success = false
-        table.foreach(network_list,
-           function(idx, network)
+        for dummy, network in ipairs(network_list) do
             if network.password then
                 success = NetworkMgr:authenticateNetwork(network)
                 if success then
@@ -607,10 +606,10 @@ function NetworkMgr:reconnectOrShowNetworkMenu(complete_callback)
                         text = T(_("Connected to network %1"), BD.wrap(network.ssid)),
                         timeout = 3,
                     })
-                       return
+                    break
+                end
             end
         end
-           end)
         if not success then
             UIManager:show(require("ui/widget/networksetting"):new{
                 network_list = network_list,