shared: Session: Use String characters instead of String class instance

Gives weird build errors since Kotlin 2.0.0

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

shared/src/commonMain/kotlin/app/opass/ccip/network/models/schedule/Session.kt

@@ -54,7 +54,7 @@ data class Session(
 
     @Serializable
     data class Localized(
-        val description: String = String(),
+        val description: String = "",
         val title: String
     )
 }