Minor fixes

- Fix categories modal showing when adding from source with no categories
- Use old categories icon in library bottom action menu

app/src/main/java/eu/kanade/tachiyomi/AppInfo.kt

@@ -5,6 +5,7 @@ package eu.kanade.tachiyomi
  *
  * @since extension-lib 1.3
  */
+@Suppress("UNUSED")
 object AppInfo {
     fun getVersionCode() = BuildConfig.VERSION_CODE
     fun getVersionName() = BuildConfig.VERSION_NAME