remove .jshint config since ES5 setting is now default
remove .jshint config since ES5 setting is now default

Reviewed by Jeffrey Heifetz <jheifetz@blackberry.com>

corimf/cordova-blackberry,blackberry/cordova-blackberry,blackberry/cordova-blackberry,blackberry/cordova-blackberry,apache/cordova-blackberry,corimf/cordova-blackberry,apache/cordova-blackberry,apache/cordova-blackberry,corimf/cordova-blackberry