Use Plugins DSL in Kotlin Gradle scripts

When plugins DSL is used, there is no need to
manually generate typesafe accessors for extensions and
conventions (by running `./gradlew kotlinDslAccessorsSnapshot`).

js/js.translator/build.gradle.kts

@@ -2,11 +2,10 @@ import org.gradle.plugins.ide.idea.model.IdeaModel
 
 plugins {
     idea
+    kotlin("jvm")
+    id("jps-compatible")
 }
 
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
-
 jvmTarget = "1.6"
 
 dependencies {