Fix sticky toggle crashes on maximized windows

[D-Brox]

Currently, after untoggling sticky while maximized, MaximizedState::original_layer remains with value ManagedLayer::Sticky, which can lead to a crash when unmaximizing the window by reaching an unreachable!() statement.

Closes #1074

[D-Brox]

After some testing on the first commit of this PR, I found this crash:

2025-01-04T11:26:42.209424-03:00 zuka cosmic-comp[8141]: thread 'main' panicked at 'assertion failed: was_floating.is_some() != was_tiled.is_some()': src/shell/mod.rs:2745#012
   0: <backtrace::capture::Backtrace as core::default::Default>::default#012
   1: log_panics::Config::install_panic_hook::{{closure}}#012
   2: std::panicking::rust_panic_with_hook#012
   3: std::panicking::begin_panic_handler::{{closure}}#012
   4: std::sys_common::backtrace::__rust_end_short_backtrace#012
   5: rust_begin_unwind#012
   6: core::panicking::panic_fmt#012
   7: core::panicking::panic#012   8: cosmic_comp::shell::Shell::move_request#012
   9: <core::option::Option<F> as calloop::sources::IdleDispatcher<Data>>::dispatch#012
  10: calloop::loop_logic::EventLoop<Data>::run#012
  11: cosmic_comp::main#012
  12: std::sys_common::backtrace::__rust_begin_short_backtrace#012  13: main#012
  14: __libc_start_call_main#012
             at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16#012
  15: __libc_start_main_impl#012
             at ./csu/../csu/libc-start.c:360:3#012  16: _start

I was able to cause the crash above multiple times using a combination of the sticky and maximize toggles in tiling mode with a window stack. At some point, the the surface was duplicated for the windows, one in tiling mode and one in floating mode, and moving them lead to the crashes.

Anyway, after some investigation I noticed the same thing as before was happening when toggling sticky while maximized, MaximizedState::original_layer didn't update to the value ManagedLayer::Sticky.

I couldn't replicate the crash after my second commit, so I'm pretty sure both crashes related to sticky+maximize are fixed now.

[Drakulix]

Thanks for looking into this. Seems good to me!