vim-patch:8.0.1809: various typos

Problem:    Various typos.
Solution:   Correct the mistakes, change "cursur" to "cursor". (closes vim/vim#2887)
b946482190

src/nvim/ui.c

@@ -393,7 +393,7 @@ void ui_cursor_shape(void)
     mode_idx = new_mode_idx;
     pending_mode_update = true;
   }
-  conceal_check_cursur_line();
+  conceal_check_cursor_line();
 }
 
 /// Returns true if `widget` is externalized.