Fix config defaults that aren't actually valid

These two attributes don't parse for me, giving errors along the lines of:
```bash
Chef::Mixin::Template::TemplateError (Option plugins must be a kind of TrueClassFalseClass!  You passed "1".) on line #172:

170: pluginpath=<%= @config.pluginpath %>
171: <% end %>
172: <% if @config.plugins %>
173: plugins=1
174: <% else %>
```