patch 9.1.0145: v:echospace not correct when 'showcmdloc' != last

Problem:  the amount of available space (v:echospace) on the command
          line is not correct when showcmdloc is drawn into the
          statusline or tabline.
Solution: only add SHOWCMD_COLS to the shown command column when
          'showcmdloc' is set to last (Sam-programs)

closes: #14108

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Sam-programs <130783534+Sam-programs@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/screen.c b/src/screen.c
index 939a335..208b182 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -4536,7 +4536,7 @@
 	if (!last_has_status)
 	    sc_col = ru_col;
     }
-    if (p_sc)
+    if (p_sc && *p_sloc == 'l')
     {
 	sc_col += SHOWCMD_COLS;
 	if (!p_ru || last_has_status)	    // no need for separating space