fix(tazjin/emacs): Correctly pass through additional attributes

We really need target list diffing, would have caught this earlier.

Change-Id: Ifc064400b3115c6e2242d0b503cde4216b2ee787
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5257
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/tazjin/emacs/default.nix

@@ -128,7 +128,7 @@ pkgs.makeOverridable
       '';
   in
   lib.fix
-    (self: l: f: pkgs.writeShellScriptBin "tazjins-emacs" ''
+    (self: l: f: (pkgs.writeShellScriptBin "tazjins-emacs" ''
       export PATH="${emacsBinPath}:$PATH"
       exec ${tazjinsEmacs f}/bin/emacs \
         --debug-init \
@@ -137,7 +137,9 @@ pkgs.makeOverridable
         --no-init-file \
         --directory ${./config} ${if l != null then "--directory ${l}" else ""} \
         --eval "(require 'init)" $@
-    '' // {
+    '').overrideAttrs
+      (_: {
+        passthru = {
           # Call overrideEmacs with a function (pkgs -> pkgs) to modify the
           # packages that should be included in this Emacs distribution.
           overrideEmacs = f': self l f';
@@ -163,9 +165,12 @@ pkgs.makeOverridable
 
           # Expose telega/tdlib version check as a target that is built in
           # CI.
+          #
+          # TODO(tazjin): uncomment when telega works again
           inherit tdlibCheck;
           meta.ci.targets = [ "tdlibCheck" ];
-    })
+        };
+      }))
     null
     identity
   )