Restore the call to initConfig in FlutterLoader (#18257)

This was accidentally removed in https://github.com/flutter/engine/pull/18182
diff --git a/shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java b/shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java
index bbb1f63..a2fdc97 100644
--- a/shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java
+++ b/shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java
@@ -115,6 +115,7 @@
     this.settings = settings;
 
     initStartTimestampMillis = SystemClock.uptimeMillis();
+    initConfig(applicationContext);
     initResources(applicationContext);
 
     System.loadLibrary("flutter");