patch 8.1.0982: update_cursor() called twice in :shell

Problem:    update_cursor() called twice in :shell.
Solution:   Remove one of the calls. (Yasuhiro Matsumoto, closes #4039)

src/terminal.c

@@ -3265,7 +3265,6 @@ update_system_term(term_T *term)
 
     term->tl_dirty_row_start = MAX_ROW;
     term->tl_dirty_row_end = 0;
-    update_cursor(term, TRUE);
 }
 #endif
 

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    982,
 /**/
     981,
 /**/