Fix comma in licence checker.

license-checker.cfg

@@ -21,7 +21,7 @@
                 "glslang/OSDependent/Web/glslang.*.js",
 
                 "glslang/MachineIndependent/glslang_tab.cpp",
-                "glslang/MachineIndependent/glslang_tab.cpp.h",
+                "glslang/MachineIndependent/glslang_tab.cpp.h"
             ]
         }
     ],