chore: remove un used code

src/background.ts

@@ -1,18 +1,6 @@
 import browser from 'webextension-polyfill';
 import WakaTimeCore from './core/WakaTimeCore';
 
-// Add a listener to resolve alarms
-browser.alarms.onAlarm.addListener(async (alarm) => {
-  // |alarm| can be undefined because onAlarm also gets called from
-  // window.setTimeout on old chrome versions.
-  // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
-  if (alarm?.name == 'heartbeatAlarm') {
-    console.log('recording a heartbeat - alarm triggered');
-
-    await WakaTimeCore.recordHeartbeat();
-  }
-});
-
 /**
  * Whenever a active tab is changed it records a heartbeat with that tab url.
  */
@@ -28,8 +16,6 @@ browser.windows.onFocusChanged.addListener(async (windowId) => {
   if (windowId != browser.windows.WINDOW_ID_NONE) {
     console.log('recording a heartbeat - active window changed');
     await WakaTimeCore.recordHeartbeat();
-  } else {
-    console.log('lost focus');
   }
 });