vesktop: add disable update checking patch

As discussed in [NixOS/nixpkgs#281669](https://github.com/NixOS/nixpkgs/pull/281669#issuecomment-1899451746), it might be more beneficial to disable the update checker
and prevent the users from being annoyed to update to a version that's
not yet built in Nixpkgs.

A builtin option for disabling the update checker does exist, however
it's buried very deeply within Vesktop settings and normal users may not
ever be aware of its existence — better to do it in Nixpkgs itself

pkgs/by-name/ve/vesktop/disable_update_checking.patch

@@ -0,0 +1,12 @@
+diff --git a/src/updater/main.ts b/src/updater/main.ts
+index 059afb9..274802e 100644
+--- a/src/updater/main.ts
++++ b/src/updater/main.ts
+@@ -77,6 +77,7 @@ function isOutdated(oldVersion: string, newVersion: string) {
+ }
+ 
+ export async function checkUpdates() {
++    return;
+     if (Settings.store.checkUpdates === false) return;
+ 
+     try {

pkgs/by-name/ve/vesktop/package.nix

@@ -87,6 +87,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   patches = [
     (substituteAll { inherit vencord; src = ./use_system_vencord.patch; })
+    ./disable_update_checking.patch
   ];
 
   ELECTRON_SKIP_BINARY_DOWNLOAD = 1;