Escape shell words (e.g. parentheses for Array literal)

Author: r7kamura

lib/serverkit/resources/defaults.rb

@@ -88,7 +88,7 @@ def read_raw_value
 
       # @return [String]
       def value_in_plist
-        Plist.generate(value)
+        ::Shellwords.shellescape(Plist.generate(value))
       end
 
       # @return [String]