Remove unnecessary duplication

This duplication was introduced to isolate npm specific scopes
however it actually doesn't work as intended so we can simply remove it
since a better design is required here anyway.

Author: Sergey Mashkov

kotlin-frontend/src/main/kotlin/org/jetbrains/kotlin/gradle/frontend/PackageManager.kt

@@ -10,12 +10,7 @@ interface PackageManager {
     fun require(dependencies: List<Dependency>)
     fun install(project: Project)
 
-    fun require(name: String, versionOrUri: String = "*", scope: String = DevelopmentScope) {
+    fun require(name: String, versionOrUri: String = "*", scope: String = Dependency.DevelopmentScope) {
         require(listOf(Dependency(name, versionOrUri, scope)))
     }
-
-    companion object {
-        val DevelopmentScope = "development"
-        val RuntimeScope = "runtime"
-    }
 }