fix(flameshot): configure flameshot to use grim

hosts/canopus/home.nix

@@ -48,6 +48,11 @@
   services.flameshot = {
     enable = true;
     package = pkgs.flameshot.override {enableWlrSupport = true;};
+    settings = {
+      General = {
+        useGrimAdapter = true;
+      };
+    };
   };
 
   home.packages = with pkgs; [