Fix problem in briefClone

It was too brief. So brief that forgot to copy some important fields.

src/nimblepkg/options.nim

@@ -409,5 +409,7 @@ proc briefClone*(options: Options): Options =
   var newOptions = initOptions()
   newOptions.config = options.config
   newOptions.nimbleData = options.nimbleData
+  newOptions.nimbleDir = options.nimbleDir
+  newOptions.forcePrompts = options.forcePrompts
   newOptions.pkgInfoCache = options.pkgInfoCache
   return newOptions