Fix more things

Author: Pururun

android/app/src/main/kotlin/net/mullvad/mullvadvpn/compose/screen/FilterScreen.kt

@@ -21,6 +21,7 @@ import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
@@ -233,7 +234,7 @@ private fun TopBar(onBackClick: () -> Unit) {
             Icon(
                 painter = painterResource(id = R.drawable.icon_back),
                 contentDescription = null,
-                tint = Color.Unspecified,
+                tint = MaterialTheme.colorScheme.onPrimary,
             )
         }
         Text(