Correct the stack size of DM testcase
The stack size of DM testcase is too big, so that needs to shrink to 2048.
#define TC_SYSTEMIO_STACK 2048
#endif
#if defined(CONFIG_EXAMPLES_TESTCASE_DM_UTC) || defined(CONFIG_EXAMPLES_TESTCASE_DM_ITC)
-#define TC_DM_STACK 20480
+#define TC_DM_STACK 2048
#endif
#ifdef CONFIG_EXAMPLES_TESTCASE_WIFI_MANAGER_UTC
#define TC_WIFI_MANAGER_STACK 2048
