patch 8.2.4043: using int for second argument of ga_init2()

Problem:    Using int for second argument of ga_init2().
Solution:   Remove unnessary type cast (int) when using sizeof().
diff --git a/src/menu.c b/src/menu.c
index 614196a..880a93a 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -2664,7 +2664,7 @@
     char_u		*from, *from_noamp, *to;
 
     if (menutrans_ga.ga_itemsize == 0)
-	ga_init2(&menutrans_ga, (int)sizeof(menutrans_T), 5);
+	ga_init2(&menutrans_ga, sizeof(menutrans_T), 5);
 
     /*
      * ":menutrans clear": clear all translations.