fix expected/actual order in a test

Author: SethTisue

binary-compat/test/src/test/scala/BinaryCompaTest.scala

@@ -23,6 +23,6 @@ class BinaryCompaTest {
     Config.setup("foo", Array(oldClasspath, newClasspath))
     val mima        = new MiMaLib(Config.baseClassPath)
     val allProblems = mima.collectProblems(oldClasspath, newClasspath)
-    Assert.assertEquals(allProblems, Nil)
+    Assert.assertEquals(Nil, allProblems)
   }
 }