new-folder-dialog-controller: Remove the new folder name suggestion

After we create a new folder, when we proceed to create another one,
the name of the previous folder is used as suggestion, although there
already exists a file with that particular name.

In this patch, we solve this problem by removing the initial text
added in the new folder name box.

GNOME/nautilus#206
1 job for remove-new-folder-name-suggestion in 9 minutes and 20 seconds (queued for 20 minutes and 13 seconds)
Status Job ID Name Coverage
  Test
passed #7836
test

00:09:20

0.0%