Move sizeof to second argument in calloc calls

Clears -Wcalloc-transposed-args warnings from gcc 14.1, such as:

../dix/main.c:165:42: warning: ‘calloc’ sizes specified with ‘sizeof’ in the
 earlier argument and not in the later argument [-Wcalloc-transposed-args]
  165 |             serverClient = calloc(sizeof(ClientRec), 1);
      |                                          ^~~~~~~~~
../dix/main.c:165:42: note: earlier argument should specify number of
 elements, later size of each element

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1606>

dix/main.c

@@ -162,7 +162,7 @@ dix_main(int argc, char *argv[], char *envp[])
             CreateWellKnownSockets();
             for (i = 1; i < LimitClients; i++)
                 clients[i] = NullClient;
-            serverClient = calloc(sizeof(ClientRec), 1);
+            serverClient = calloc(1, sizeof(ClientRec));
             if (!serverClient)
                 FatalError("couldn't create server client");
             InitClient(serverClient, 0, (void *) NULL);