(bug 48145) Assigning absolute position to snak type selector menu

The snak type selector menu needs to be positioned "absolute" in order to not have its
position affected by rescaling the value variation DOM structure.

Change-Id: I16d45c98339ed49b6a26abb00512ef8055edc1b4
Merge "(bug 48145) Assigning absolute position to snak type selector menu"