feat(ui/MSALoginDialog): use libqrencode for qr codes

`qrcodegen` isn't available in most repositories, package discovery
scripts for it are maintained in a different repository, and they are
bugged for Windows at least. This basically forces us into vendoring it,
which isn't cool; libqrencode seems like viable alternative used by many
more apps

Signed-off-by: Seth Flynn <getchoo@tuta.io>

flake.nix

@@ -15,11 +15,6 @@
       url = "github:PrismLauncher/libnbtplusplus";
       flake = false;
     };
-
-    qrcodegenerator = {
-      url = "github:nayuki/QR-Code-generator";
-      flake = false;
-    };
   };
 
   outputs =
@@ -27,7 +22,6 @@
       self,
       nixpkgs,
       libnbtplusplus,
-      qrcodegenerator,
     }:
 
     let
@@ -175,7 +169,6 @@
         prismlauncher-unwrapped = prev.callPackage ./nix/unwrapped.nix {
           inherit
             libnbtplusplus
-            qrcodegenerator
             self
             ;
         };