Reset default greenred iconAnchor xy in osm_get_js

Those icons were misplaced on picture map: iconAnchor needed to be updated.
To solve this I copied default values from L.Icon.Default options in leaflet-src.js (3395) https://github.com/xbgmsharp/piwigo-openstreetmap/blob/master/leaflet/leaflet-src.js#L3395
I did the same for popupAnchor because blue default icon has the same footprint as green and red default icons, and because leaflet-src.js is reliable. It's better with 1 x value that let the popup centered, but if -34 y value seems to high for wide maps not that tall, it would be great to move the popup on the side.

Author: 7tonin

include/functions_map.php

@@ -396,8 +396,8 @@ function osm_get_js($conf, $local_conf, $js_data)
                 shadowUrl: 'plugins/piwigo-openstreetmap/leaflet/images/marker-shadow.png',
                 iconSize:     [25, 41],
                 shadowSize:   [41, 41],
-                iconAnchor:   [21, 21],
-                popupAnchor:  [-10, -10]
+                iconAnchor:   [12, 41],
+                popupAnchor:  [1, -34]
             }
         });