refactor: streamline address validation in EuiccConfiguredAddresses by consolidating checks into a single function

libs/lpac-jni/src/main/java/net/typeblog/lpac_jni/EuiccConfiguredAddresses.kt

@@ -10,12 +10,12 @@ data class EuiccConfiguredAddresses(
         get() = isValid(defaultDPAddress)
 
     val isValidRootDSAddress: Boolean
-        get() = isValid(rootDSAddress) || rootDSAddress == "lpa.ds.gsma.com"
+        get() = isValid(rootDSAddress)
 }
 
 private fun isValid(address: String): Boolean {
     if (address.isBlank()) return false
-    if (address.endsWith(".gsma.com")) return false
+    if (address.endsWith(".gsma.com")) return address == "lpa.ds.gsma.com"
     if (address.endsWith(".example.com")) return false
     return Patterns.DOMAIN_NAME.matcher(address).matches()
 }