Fixed error code check

Author: ironikart

Tests/WCAG2/1_4_3_Contrast.html

@@ -5,7 +5,7 @@
 <!-- @HTMLCS_Test@
 Name: SC 1.4.3 Contrast
 Standard: WCAG2AA
-Assert: Error *.G18 on #basicContrastFail
+Assert: Error *.G18.Fail on #basicContrastFail
 Assert: No Error *.G18 on #issue155
 -->
 </head>