Improve spacing of run sheet personnel

[tbar0970]

When roster role titles wrap onto a second line, and there are 2 assignees, it looks a bit like it's two different roles.

This could be fixed by tightening the line spacing in the <label>.

In this screenshot, "packup and cleaning" demonstrates the problem. "Setup and welcome" is improved by the following styling :

    line-height: 16px;
    padding-top: 2px;