Fix window undimming when reader custom filter settings are open

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -113,6 +113,10 @@ class MainActivity : BaseActivity() {
 
     private var navigator: Navigator? = null
 
+    init {
+        registerSecureActivity(this)
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         val isLaunch = savedInstanceState == null
 
@@ -429,10 +433,6 @@ class MainActivity : BaseActivity() {
         return true
     }
 
-    init {
-        registerSecureActivity(this)
-    }
-
     companion object {
         // Splash screen
         private const val SPLASH_MIN_DURATION = 500 // ms