jj: revert default diff format to color-words

Two-pane difft output is nice, but it requires wider terminal screen. Inline
difft is a bit confusing because middle context lines are omitted.
1 files changed, 0 insertions(+), 1 deletions(-)

M dot.jjconfig.toml
M dot.jjconfig.toml +0 -1
@@ 25,7 25,6 @@ op_log_node = 'builtin_op_log_node_ascii
 
 [ui]
 allow-filesets = true
-diff.tool = "difft"
 merge-editor = "kdiff3"
 pager = ["less", "-RSX"]