Remove side nav icon alignment preference

Simplifying it to just always be centered, which is what most Google apps seem to be doing anyway.

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

@@ -6,7 +6,6 @@ import android.content.Intent
 import android.graphics.Color
 import android.os.Build
 import android.os.Bundle
-import android.view.Gravity
 import android.view.ViewGroup
 import android.view.Window
 import android.widget.Toast
@@ -158,18 +157,6 @@ class MainActivity : BaseActivity() {
         }
         setSplashScreenExitAnimation(splashScreen)
 
-        if (binding.sideNav != null) {
-            uiPreferences.sideNavIconAlignment()
-                .asHotFlow {
-                    binding.sideNav?.menuGravity = when (it) {
-                        1 -> Gravity.CENTER
-                        2 -> Gravity.BOTTOM
-                        else -> Gravity.TOP
-                    }
-                }
-                .launchIn(lifecycleScope)
-        }
-
         nav.setOnItemSelectedListener { item ->
             val id = item.itemId