revert that test and opened up a separate issue to deal with Windows and system check

Author: jwoertink

src/web_app_skeleton/script/system_check.cr.ecr

@@ -11,14 +11,9 @@ require "./helpers/*"
 #     should go in your Procfile.dev.
 
 <%- if browser? -%>
-{% if flag?(:windows) %}
-# Crystal appends ".exe" to the end of the command when searching for an executable; however,
-# depending on how you installed yarn, there may not be a "yarn.exe" available causing this to fail
-{% else %}
 if command_not_found "yarn"
   print_error "Yarn is not installed\n  See https://yarnpkg.com/lang/en/docs/install/ for install instructions."
 end
-{% end %}
 <%- end -%>
 
 # CUSTOM PRE-BOOT CHECKS