vis: allow mapping of <Space>

One should generally use <Space> in mappings:

 :map! normal <Space> h

except for insert/replace mode where a literal space has to be used:

 :map! insert " " foo

1 files changed, 1 insertions, 1 deletions

diff --git a/vis.c b/vis.c
index 4926555..c59133b 100644
--- a/vis.c
+++ b/vis.c
@@ -361,7 +361,7 @@ Vis *vis_new(Ui *ui, VisEvent *event) {
 		goto err;
 	if (!(vis->search_file = file_new_internal(vis, NULL)))
 		goto err;
-	if (!(vis->keymap = map_new()))
+	if (!(vis->keymap = map_new()) || !map_put(vis->keymap, " ", "<Space>"))
 		goto err;
 	vis->mode_prev = vis->mode = &vis_modes[VIS_MODE_NORMAL];
 	vis->event = event;