Update tests to old behavior

Author: Azoy

test/attr/attr_implements_bad_parse.swift

@@ -1,7 +1,7 @@
 // RUN: %target-swift-frontend -parse -verify %s
 
 struct S0 {
-  @_implements(1, Foo) // OK. We can parse integers as types now, so this is fine. We will diagnose its incorrect usage during type checking.
+  @_implements(1, Foo) // expected-error {{expected type}}
   func f() { }
 }
 

test/expr/postfix/init/unqualified.swift

@@ -62,7 +62,7 @@ class Theodosia: Aaron {
 
     // FIXME: We could optimistically parse this as an expression instead
     // expected-error@+2 {{initializers may only be declared within a type}}
-    // expected-error@+1 {{integer unexpectedly used in a type position}}
+    // expected-error@+1 {{expected parameter type following ':'}}
     init(z: 0)
   }
 
@@ -98,7 +98,7 @@ struct AaronStruct {
 
     // FIXME: We could optimistically parse this as an expression instead
     // expected-error@+2 {{initializers may only be declared within a type}}
-    // expected-error@+1 {{integer unexpectedly used in a type position}}
+    // expected-error@+1 {{expected parameter type following ':'}}
     init(y: 1)
   }