flavor: Move default dispenser logic to build flavor

There is no default dispenser on Huawei builds

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/vanilla/java/com/aurora/store/util/FlavouredUtil.kt

@@ -1,10 +1,13 @@
 package com.aurora.store.util
 
 import android.content.Context
+import com.aurora.Constants
 
 object FlavouredUtil : IFlavouredUtil {
 
+    override val defaultDispensers = setOf(Constants.URL_DISPENSER)
+
     override fun promptMicroGInstall(context: Context): Boolean {
         return false
     }
-}
+}