Inconsistent line length for different XML editors in ESCET dev env

We have a line length of 120 for org.eclipse.wst.xml.core, but there is now also org.eclipse.wildwebdeveloper.xml with its own line length, defaulting to 80. We should have consistent line length for these two XML editors that are both used in the ESCET development environment.

Disclaimer: Note that this issue is not about whether we want to have a maximum line length or not. We are discussing that in #741 (closed), so let's not discuss that here. Until we decide we don't want a line limit, and if we ever do, we we will have a line limit until then. So, for now it needs to be consistent.