style(MinerrPass): remove unnecessary \" wrapping MINERR_URL

In the MINERR_SOURCE template, there is a placeholder that will be
replaced with a url that is passed into the tool.  Currently the placeholder
is \"MINERR_URL\".  The extra escaped quotes are not necessary and can be
confusing, given that the template is already a javascript function inside
a java string.

This wasn't actually causing the failure on the Windows machine.
That is to be fixed in the grunt-util.js but this change will just make it easier to maintain this codebase.