refine pwa app icons

public/manifest.webmanifest

@@ -3,6 +3,16 @@
   "description": "Sqliteviz is a single-page application for fully client-side visualisation of SQLite databases or CSV.",
   "display": "fullscreen",
   "icons": [
+    {
+      "src": "favicon.png",
+      "sizes": "32x32",
+      "type": "image/png"
+    },
+    {
+      "src": "Logo48x48.png",
+      "sizes": "48x48",
+      "type": "image/png"
+    },
     {
       "src": "Logo192x192.png",
       "sizes": "192x192",

tests/components/DbUploader.spec.js

@@ -882,5 +882,5 @@ describe('DbUploader.vue import CSV', () => {
     await newDb.loadDb.returnValues[0]
     expect(actions.addTab.calledOnce).to.equal(true)
     expect(mutations.setCurrentTabId.calledOnce).to.equal(true)
- })
+  })
 })