rosenthal: Remove emacs-xonsh-mode. [upstreamed]

* rosenthal/packages/emacs-xyz.scm (emacs-xonsh-mode): Delete variable.

rosenthal/packages/emacs-xyz.scm

@@ -129,30 +129,3 @@ and metrics generated from your programming activity.")
                 (sha256
                  (base32
                   "1qlpszfvi1zngfi377pxkb9byhw0x8h4wsc70jn2slddq0jryjad")))))))
-
-;; https://issues.guix.gnu.org/44165
-(define-public emacs-xonsh-mode
-  ;; There is no tagged release yet.
-  (let ((commit "7fa581524533a9b6b770426e4445e571a69e469d")
-        (revision "0"))
-    (package
-      (name "emacs-xonsh-mode")
-      (version (git-version "0" revision commit))
-      (source (origin
-                (method git-fetch)
-                (uri (git-reference
-                      (url "https://github.com/seanfarley/xonsh-mode")
-                      (commit commit)))
-                (file-name (git-file-name name version))
-                (sha256
-                 (base32
-                  "0lfi2372clkkzi4a940fwparsfhxxzb7bmysfd50n1myakgldri5"))))
-      (build-system emacs-build-system)
-      (home-page "https://github.com/seanfarley/xonsh-mode")
-      (synopsis "Emacs major mode for editing @code{xonshrc} files")
-      (description
-       "This package implements a major mode for xonsh scripts.  The basic
-functionality includes syntax highlight for xonsh operators.  Files with the
-@file{.xonshrc} or @file{.xsh} extension are automatically opened with this
-mode.")
-      (license license:gpl3+))))