Fix various small issues

Author: PhrozenByte

pyproject.toml

@@ -39,7 +39,6 @@ classifiers = [
 ]
 requires-python = ">=3.7"
 dependencies = [
-    "bidict",
     "packaging",
     "dbus-fast;sys_platform=='linux'",
     "rubicon-objc;sys_platform=='darwin'",

src/desktop_notifier/backends/dbus.py

@@ -234,7 +234,7 @@ def _on_closed(self, nid: int, reason: int) -> None:
 
     async def get_capabilities(self) -> frozenset[Capability]:
         if not self.interface:
-            self.interface = await self._init_dbus()
+            await self._init_dbus()
 
         capabilities = {
             Capability.APP_NAME,

src/desktop_notifier/main.py

@@ -157,7 +157,7 @@ def app_name(self, value: str) -> None:
         self._backend.app_name = value
 
     @property
-    def app_icon(self) -> str | None:
+    def app_icon(self) -> Icon | None:
         """The application icon"""
         return self._backend.app_icon