Fix mypy errors and install dependencies on Fedora

Author: MightyCreak

docs/developers/developers-setup.md

@@ -3,6 +3,7 @@
 ## Requirements
 
 Diffuse depends on these projects:
+
 * Python 3.8+
 * PyPi
 * Cairo and GObject Introspection development headers
@@ -28,7 +29,7 @@ _Note: Tested on Debian 11 (Buster) and Ubuntu 20.04 (Focal)_
     <summary>Fedora</summary>
 
 ```sh
-sudo dnf install python-pip python3-cairo-devel python3-gobject-devel meson flatpak flatpak-builder
+sudo dnf install python-pip cairo-devel cairo-gobject-devel meson flatpak flatpak-builder
 ```
 
 _Note: Tested on Fedora 34_

src/diffuse/resources.py

@@ -318,7 +318,7 @@ def getOption(self, option: str) -> str:
 
     def getOptionAsBool(self, option: str) -> bool:
         '''Get the option value, casted as a boolean.'''
-        return util.strtobool(self.getOption(option))
+        return bool(util.strtobool(self.getOption(option)))
 
     # string resources
     def getString(self, symbol: str) -> str: