obsidian: drop x86_64-darwin support

pkgs/by-name/ob/obsidian/package.nix

@@ -33,12 +33,11 @@ let
     platforms = [
       "x86_64-linux"
       "aarch64-linux"
-      "x86_64-darwin"
       "aarch64-darwin"
     ];
   };
 
-  srcs = rec {
+  srcs = {
     x86_64-linux = fetchurl {
       url = "https://github.com/obsidianmd/obsidian-releases/releases/download/v${version}/obsidian-${version}.tar.gz";
       hash = "sha256-/L4IsRHZwf2wm5wIlSsG4cgpxiFj66JYTEtOyFm+B50=";
@@ -49,12 +48,10 @@ let
       hash = "sha256-a8hye/27bXMdWvmgb1HW3nBhxoyQjIrotDqe03miAmA=";
     };
 
-    x86_64-darwin = fetchurl {
+    aarch64-darwin = fetchurl {
       url = "https://github.com/obsidianmd/obsidian-releases/releases/download/v${version}/Obsidian-${version}.dmg";
       hash = "sha256-O4XBO0zlVRLobhcKfNKklOLbaVrIiMBgHhU8uFt3iBs=";
     };
-
-    aarch64-darwin = x86_64-darwin;
   };
 
   src =