Remove the unneccesary buildscript closure.

worldedit-sponge/build.gradle

@@ -1,12 +1,3 @@
-buildscript {
-    repositories {
-        mavenCentral()
-        maven { url = "http://files.minecraftforge.net/maven" }
-        maven { url = "https://oss.sonatype.org/content/repositories/snapshots/" }
-        jcenter()
-    }
-}
-
 plugins {
     id 'org.spongepowered.plugin' version '0.6'
 }