git-gui: Fix switch statement in lib/merge.tcl

0aea2842 (Make Ctrl-T safe to use for conflicting files) introduced a new
case, but forgot the '-' to indicate that it shares the body with the
subsequent case label.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
1 file changed