Remove the directories dependency (#4904)

eframe now has its own logic to find the storage_dir to persist the app
when the persistence feature is enabled, instead of using the
directories crate. The directory should be the same as before (verified
with a unit test).

* Closes <https://github.com/emilk/egui/issues/4884>
* [x] I have followed the instructions in the PR template

Cargo.lock

@@ -1180,6 +1180,7 @@ dependencies = [
  "glow",
  "glutin",
  "glutin-winit",
+ "home",
  "image",
  "js-sys",
  "log",
@@ -1200,6 +1201,7 @@ dependencies = [
  "web-time",
  "wgpu",
  "winapi",
+ "windows-sys 0.52.0",
  "winit",
 ]
 
@@ -2059,11 +2061,11 @@ checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"
 
 [[package]]
 name = "home"
-version = "0.5.5"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5444c27eef6923071f7ebcc33e3444508466a76f7a2b93da00ed6e19f30c1ddb"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]