change next strike time when strike is off

apps/hourstrike/app.js

@@ -31,6 +31,10 @@ function showMainMenu() {
       format: v => mode_txt[v],
       onchange: v => {
         settings.interval = mode_interval[v];
+          if (v===0) {
+            settings.next_hour = -1;
+            settings.next_minute = -1;
+          }
         updateSettings();
       }
     },

apps/hourstrike/boot.js

@@ -20,7 +20,10 @@
       settings.next_hour = t_hour;
       settings.next_minute = t.getMinutes();
     }
-    require('Storage').write('hourstrike.json', settings);
     setTimeout(function() {load("hourstrike.js");}, wait_msec);
+  } else {
+    settings.next_hour = -1;
+    settings.next_minute = -1;
   }
+  require('Storage').write('hourstrike.json', settings);
 })();