(maint) Fix language server logging to a file

Previously the case compare was looking for a non zero result which meant even
if a debug file was specified, it still used STDOUT.  This commit now correctly
identifies when a user enters stdout as the debug destination.

Author: glennsarti

server/lib/puppet-vscode/logging.rb

@@ -21,7 +21,7 @@ def self.log_message(severity, message)
   def self.init_logging(options)
     if options[:debug].nil?
       @logger = nil
-    elsif options[:debug].casecmp 'stdout'
+    elsif (options[:debug].casecmp 'stdout').zero?
       @logger = Logger.new($stdout)
     elsif !options[:debug].to_s.empty?
       # Log to file