shell: modules: kernel: streamline code

This commit includes cleanups to `kernel_service`:
- `shell_tdata_dump()`:
  Adjust formatting to align with `.clang-format`.
- `shell_stack_dump()`:
  Update to pass `sh` directly instead of `user_data` since
  it is already assigned.

Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>

subsys/shell/modules/kernel_service/thread/stacks.c

@@ -41,8 +41,8 @@ static void shell_stack_dump(const struct k_thread *thread, void *user_data)
 	/* Calculate the real size reserved for the stack */
 	pcnt = ((size - unused) * 100U) / size;
 
-	shell_print(
-		(const struct shell *)user_data, "%p %-" STRINGIFY(THREAD_MAX_NAM_LEN) "s "
+	shell_print(sh,
+		    "%p %-" STRINGIFY(THREAD_MAX_NAM_LEN) "s "
 		    "(real size %4zu):\tunused %4zu\tusage %4zu / %4zu (%2u %%)",
 		    thread, tname ? tname : "NA", size, unused, size - unused, size, pcnt);
 }