Adjust syntax tests to latest ST build (4215) (#299)

Author: rchl

tests/_Syntax_Failure/syntax_test_fail.c++

@@ -1,7 +1,7 @@
 // SYNTAX TEST "Packages/C++/C.sublime-syntax"
 #pragma once
 // <- source.c meta.preprocessor.c++
- // <- keyword.control.import
+ // <- keyword.control
 
 // foo
 // ^ source.c comment.line

tests/_Syntax_Success/syntax_test_success.c++

@@ -1,7 +1,7 @@
 // SYNTAX TEST "Packages/C++/C.sublime-syntax"
 #pragma once
 // <- source.c meta.preprocessor.c
- // <- keyword.control.import
+ // <- keyword.control
 
 // foo
 // ^ source.c comment.line