Fix test case

Author: DougGregor

test/decl/protocol/req/missing_conformance.swift

@@ -145,8 +145,8 @@ struct CountSteps1<T> : Collection {
 }
 
 extension CountSteps1 // expected-error {{type 'CountSteps1<T>' does not conform to protocol 'BidirectionalCollection'}}
-  // expected-error@+3 {{conditional conformance of type 'CountSteps1<T>' to protocol 'RandomAccessCollection' does not imply conformance to inherited protocol 'BidirectionalCollection'}}
-  // expected-note@+2 {{did you mean to explicitly state the conformance like 'extension CountSteps1: BidirectionalCollection where ...'?}}
+  // expected-error@-1 {{conditional conformance of type 'CountSteps1<T>' to protocol 'RandomAccessCollection' does not imply conformance to inherited protocol 'BidirectionalCollection'}}
+  // expected-note@-2 {{did you mean to explicitly state the conformance like 'extension CountSteps1: BidirectionalCollection where ...'?}}
   // expected-error@+1 {{type 'CountSteps1<T>' does not conform to protocol 'RandomAccessCollection'}}
   : RandomAccessCollection
      where T : Equatable