Remove unnecessary reorder on resize start

WindowManagerService#onPointerDownOutsideFocusLocked handles the focus.
ResizeTaskPositioners don't need to call reorder.

Test: manual(resize and observe caption color)
Bug: b:419353852
Flag: com.android.window.flags.enable_display_focus_in_shell_transitions

Change-Id: I3a87a42be3607ee8a180addf96ec18e558078e9a