patch 9.0.1506: line number not displayed when using 'smoothscroll'

Problem:    Line number not displayed when using 'smoothscroll'.
Solution:   Adjust condition for showing the line number. (closes #12333)
diff --git a/src/drawline.c b/src/drawline.c
index f3d70ed..e5fa15c 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -389,7 +389,7 @@
 	  // When there are text properties above the line put the line number
 	  // below them.
 	  if (wlv->row == lnum_row
-		    && (wp->w_skipcol == 0 || wlv->row > wp->w_winrow
+		    && (wp->w_skipcol == 0 || wlv->row > 0
 					       || (wp->w_p_nu && wp->w_p_rnu)))
 	  {
 	      long num;