Fixed some bugs in export import settings

src/pages/options/general/general.js

@@ -34,11 +34,15 @@ document.getElementById("update-instances").addEventListener("click", () => {
 });
 
 let exportSettingsElement = document.getElementById("export-settings");
+
+function exportSettings() {
   browser.storage.local.get(null, result => {
     let resultString = JSON.stringify(result, null, '  ');
     exportSettingsElement.href = 'data:application/json;base64,' + btoa(resultString);
     exportSettingsElement.download = 'libredirect-settings.json';
   });
+}
+exportSettings();
 
 let importSettingsElement = document.getElementById("import-settings");
 importSettingsElement.addEventListener("change",
@@ -48,6 +52,7 @@ importSettingsElement.addEventListener("change",
     reader.readAsText(file);
     reader.onload = () => browser.storage.local.set({ ...JSON.parse(reader.result) })
     reader.onerror = error => reject(error);
+    exportSettings();
   }
 );
 
@@ -56,6 +61,7 @@ resetSettingsElement.addEventListener("click",
   () => {
     console.log("reset");
     browser.storage.local.clear();
+    exportSettings();
   }
 );