Set maxZoom to max value

Why to limit zoom? As a user, I used sometimes to zoom so much.

Author: jacopotediosi

pwnagotchi/plugins/default/webgpsmap.html

@@ -141,7 +141,7 @@
       attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors &copy; <a href="https://carto.com/attributions">CARTO</a>',
       subdomains: 'abcd',
       opacity:0.8,
-//      maxZoom: 19
+      maxZoom: 20
     });
     var mymap = L.map('mapdiv');