Pebble: enable localStorage

LocalStorage native functions are overridden to keep each watchface's settings separated. It's possible the bind method do not work on older versions of android.

app/src/main/assets/app_config/js/gadgetbridge_boilerplate.js

@@ -1,5 +1,16 @@
-//clay stores the values in the localStorage
-localStorage.clear();
+if (window.Storage){
+    var prefix = GBjs.getAppUUID();
+    GBjs.gbLog("redefining local storage with prefix: " + prefix);
+
+    Storage.prototype.setItem = (function(key, value) {
+        this.call(localStorage,prefix + key, value);
+    }).bind(Storage.prototype.setItem);
+
+    Storage.prototype.getItem = (function(key) {
+        //GBjs.gbLog("I am about to return " + prefix + key);
+        return this.call(localStorage,prefix + key);
+    }).bind(Storage.prototype.getItem);
+}
 
 function loadScript(url, callback) {
     // Adding the script tag to the head as suggested before

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/ExternalPebbleJSActivity.java

@@ -69,6 +69,8 @@ public class ExternalPebbleJSActivity extends GBActivity {
         webSettings.setJavaScriptEnabled(true);
         //needed to access the DOM
         webSettings.setDomStorageEnabled(true);
+        //needed for localstorage
+        webSettings.setDatabaseEnabled(true);
 
         JSInterface gbJSInterface = new JSInterface(this);
         myWebView.addJavascriptInterface(gbJSInterface, "GBjs");