remove one duplicate test

Author: mbaluda

c/common/test/rules/includeguardsnotused/IncludeGuardsNotUsed.expected

@@ -2,4 +2,3 @@
 | headers/test4.h:0:0:0:0 | headers/test4.h | Header file test4.h is missing expected include guard. | headers/test4.h:0:0:0:0 | headers/test4.h |  |
 | headers/test5.h:0:0:0:0 | headers/test5.h | Header file test5.h is missing expected include guard. | headers/test5.h:0:0:0:0 | headers/test5.h |  |
 | headers/test7.h:0:0:0:0 | headers/test7.h | Header file test7.h is never included by reusing the include guard used by $@. | headers/test6.h:0:0:0:0 | headers/test6.h | include guard |
-| headers/test8.h:0:0:0:0 | headers/test8.h | Header file test8.h is missing expected include guard. | headers/test8.h:0:0:0:0 | headers/test8.h |  |

c/common/test/rules/includeguardsnotused/headers/excluded/coding-standards.xml

@@ -11,8 +11,4 @@
 
 #include "headers/test6.h" //NON_COMPLIANT - non unique and reported in alert for the next
 
-#include "headers/test7.h" //NON_COMPLIANT - non unique
-
-#include "headers/test8.h" //NON_COMPLIANT - missing include guard, not excluded
-
-#include "headers/excluded/test8.h" //COMPLIANT - missing include guard, but excluded via deviation
+#include "headers/test7.h" //NON_COMPLIANT - non unique