Fix app crashing when you change system theme

More specifically, this happens when you restore an
activity (not sure exactly when this happens).

android/app/src/main/java/com/massive/MainActivity.kt

@@ -1,5 +1,6 @@
 package com.massive
 
+import android.os.Bundle
 import com.facebook.react.ReactActivity
 import com.facebook.react.ReactActivityDelegate
 import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
@@ -25,4 +26,8 @@ class MainActivity : ReactActivity() {
             fabricEnabled
         )
     }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(null)
+    }
 }