checksrc.bat: Re-enabled the tests directory by default

Following the recent changes to the source in the tests directory,
re-enabled tests for the default scan.

projects/checksrc.bat

@@ -29,7 +29,7 @@ rem ***************************************************************************
   setlocal
   set CHECK_LIB=TRUE
   set CHECK_SRC=TRUE
-  set CHECK_TESTS=FALSE
+  set CHECK_TESTS=TRUE
 
 :parseArgs
   if "%~1" == "" goto prerequisites