Update Snapdrop client to be proxy friendly.

Adds location.pathname to the socket location, this is needed to make snapdrop proxiable which allows it to be used as Home Assistant Addon.

client/scripts/network.js

@@ -58,7 +58,7 @@ class ServerConnection {
         // hack to detect if deployment or development environment
         const protocol = location.protocol.startsWith('https') ? 'wss' : 'ws';
         const webrtc = window.isRtcSupported ? '/webrtc' : '/fallback';
-        const url = protocol + '://' + location.host + '/server' + webrtc;
+        const url = protocol + '://' + location.host + location.pathname + '/server' + webrtc;
         return url;
     }