Give distinct names to ValueSets widgets in Glade

At least 3 ValueSet widgets in Glade have the same name (ValueSet). This patch just give distinct names for better identification of their use and purpose.

Change-Id: I3737ffe8c9c51fb6511861fbcf312cfc308a35a1
Reviewed-on: https://gerrit.libreoffice.org/7415
Reviewed-by: Marcos Souza <marcos.souza.org@gmail.com>
Tested-by: Marcos Souza <marcos.souza.org@gmail.com>