nav: make back nav faster

Changed the egui-nav spring function so its now so slow near the
end of the aniation.

Fixes: #595

Author: jb55

Cargo.lock

@@ -16,7 +16,7 @@ dirs = "5.0.1"
 eframe = { version = "0.29.1", default-features = false, features = [ "wgpu", "wayland", "x11", "android-native-activity" ] }
 egui = { version = "0.29.1", features = ["serde"] }
 egui_extras = { version = "0.29.1", features = ["all_loaders"] }
-egui_nav = "0.2.0"
+egui_nav = { git = "https://github.com/damus-io/egui-nav", rev = "8a0508e17b02e382c04b4c3f724713a6b7807819" }
 egui_tabs = "0.2.0"
 egui_virtual_list = "0.5.0"
 ehttp = "0.2.0"