small optimization of extensions.gradle

tgbotapi.core/build.gradle

@@ -7,8 +7,8 @@ plugins {
 
 project.description = "Core part of tgbotapi with all (and only) required functionality for working with Telegram Bot API"
 
-apply from: "$mppProjectWithSerializationPresetPath"
-apply from: "$publishGradlePath"
+apply from: "$mppProjectWithSerialization"
+apply from: "$mpp_publish"
 
 kotlin {
     sourceSets {