Fix clear storage not working

It failed because it went looking for the focused / first window to
clear the storage on, but we called it before we had a window. Just
rewrite it without electron-clear-storage which doesn't really seem
necessary as a dependency, and also relaunched the app when clearing
stprage (you-had-one-job.gif). Pass the session in explicitly so it's
clear it needs it.

src/ipc.ts

@@ -174,7 +174,7 @@ ipcMain.on("ipcCall", async function (_ev: IpcMainEvent, payload) {
             break;
 
         case "clearStorage":
-            await clearDataAndRelaunch();
+            await clearDataAndRelaunch(global.mainWindow.webContents.session);
             return; // the app is about to stop, we don't need to reply to the IPC
 
         case "breadcrumbs": {