Fix false positive in cookie check

Author: wvu

tools/msftidy.rb

@@ -538,7 +538,7 @@ def check_lines
       end
 
       # do not read Set-Cookie header (ignore commented lines)
-      if ln =~ /^(?!\s*#).+\[['"]Set-Cookie['"]\]/i
+      if ln =~ /^(?!\s*#).+\[['"]Set-Cookie['"]\](?!\s*=[^=~]+)/i
         warn("Do not read Set-Cookie header directly, use res.get_cookies instead: #{ln}", idx)
       end