update Tigrane portrait. add randomness in auth screen portrait

app/src/main/java/com/pixelized/rplexicon/ui/screens/authentication/AuthenticationScreen.kt

@@ -270,8 +270,10 @@ private fun rememberPortrait(): List<Int> = rememberSaveable {
         R.drawable.im_unathana,
         R.drawable.im_brulkhai,
         R.drawable.im_leandre,
-        R.drawable.im_nelia,
-    )
+    ).shuffled().let {
+        // force nelia in the middle because of the ratio difference.
+        listOf(it[0], it[1], R.drawable.im_nelia, it[2], it[3])
+    }
 }
 
 @Composable