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/terminal.c b/src/terminal.c
index ab66ace..281c673 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -6674,8 +6674,8 @@
     HANDLE	    i_ours = NULL;
     HANDLE	    o_ours = NULL;
 
-    ga_init2(&ga_cmd, (int)sizeof(char*), 20);
-    ga_init2(&ga_env, (int)sizeof(char*), 20);
+    ga_init2(&ga_cmd, sizeof(char*), 20);
+    ga_init2(&ga_env, sizeof(char*), 20);
 
     if (argvar->v_type == VAR_STRING)
     {
@@ -7022,8 +7022,8 @@
     garray_T	    ga_cmd, ga_env;
     char_u	    *cmd = NULL;
 
-    ga_init2(&ga_cmd, (int)sizeof(char*), 20);
-    ga_init2(&ga_env, (int)sizeof(char*), 20);
+    ga_init2(&ga_cmd, sizeof(char*), 20);
+    ga_init2(&ga_env, sizeof(char*), 20);
 
     if (argvar->v_type == VAR_STRING)
     {