patch 8.2.3460: some type casts are not needed

Problem:    Some type casts are not needed.
Solution:   Remove unnecessary type casts. (closes #8934)
diff --git a/src/move.c b/src/move.c
index ea86b88..9e3a714 100644
--- a/src/move.c
+++ b/src/move.c
@@ -1028,7 +1028,7 @@
 	    // column
 	    sbr = get_showbreak_value(curwin);
 	    if (*sbr && *ml_get_cursor() == NUL
-				    && curwin->w_wcol == (int)vim_strsize(sbr))
+				    && curwin->w_wcol == vim_strsize(sbr))
 		curwin->w_wcol = 0;
 #endif
 	}