Revert https://github.com/SeaDve/Kooha/commit/10e314e1c41a
until x11-toolkits/libadwaita is updated to newer ABI

--- Cargo.toml.orig	2021-09-23 07:50:54 UTC
+++ Cargo.toml
@@ -15,8 +15,8 @@ pretty_env_logger = "0.4"
 once_cell = "1.5"
 gettext-rs = { version = "0.7", features = ["gettext-system"] }
 ashpd = { version = "0.2.0-alpha-3", features = ["feature_gtk4"] }
-gtk = { package = "gtk4", version = "0.3" }
-adw = { package = "libadwaita", version = "0.1.0-alpha-4" }
+gtk = { package = "gtk4", version = "0.2" }
+adw = { package = "libadwaita", version = "0.1.0-alpha-3" }
 gst = { package = "gstreamer", version = "0.17" }
 gst-plugin-gif = "0.7.0"
 futures = "0.3.16"
--- src/backend/screencast_portal.rs.orig	2021-09-23 07:50:54 UTC
+++ src/backend/screencast_portal.rs
@@ -88,7 +88,7 @@ impl ScreencastPortal {
                 ScreencastPortalResponse::Success(streams, fd)
             }
             Err(error) => match error {
-                ashpd::Error::Response(ResponseError::Cancelled) => {
+                ashpd::Error::Portal(ResponseError::Cancelled) => {
                     log::info!("Select sources cancelled");
                     ScreencastPortalResponse::Cancelled
                 }