[K/N] Remove remains of jcenter from kotlin-native/

Revert two special entries

Use proper mavenCentral()

Remove remains of jcenter from kotlin-native/

Merge-request: KT-MR-7610
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/tools/performance-server/ui/build.gradle

@@ -24,9 +24,7 @@ buildscript {
     apply from: "$rootBuildDirectory/gradle/kotlinGradlePlugin.gradle"
 
     repositories {
-        maven {
-            url 'https://cache-redirector.jetbrains.com/jcenter'
-        }
+        mavenCentral()
         maven {
             url project.bootstrapKotlinRepo
         }
@@ -38,9 +36,7 @@ buildscript {
 }
 
 repositories {
-    maven {
-        url 'https://cache-redirector.jetbrains.com/jcenter'
-    }
+    mavenCentral()
     maven {
         url project.bootstrapKotlinRepo
     }