Remove unnecessary configuration for scala compilation.

Author: ldaley

language-adaptors/rxjava-scala/build.gradle

@@ -13,31 +13,7 @@ tasks.withType(ScalaCompile) {
 }
 
 sourceSets { 
-	main { 
-        scala { 
-            srcDir 'src/main/scala'
-        }
-    }
-    test { 
-        scala { 
-            srcDir 'src/main/scala'
-            srcDir 'src/test/scala'
-            srcDir 'src/examples/scala'
-            //srcDir 'src/examples/java'
-        }
-        java.srcDirs = []
-    }
-    examples {
-        // It seems that in Gradle, the dependency "compileScala depends on compileJava" is hardcoded,
-        // or at least not meant to be removed.
-        // However, compileScala also runs javac at the very end, so we just add the Java sources to
-        // the scala source set:
-        scala { 
-            srcDir 'src/examples/scala'
-            //srcDir 'src/examples/java'
-        }
-        java.srcDirs = []
-    }
+    test.scala.srcDir 'src/examples/scala'
 }
 
 dependencies {