Revert "gnu: python-yewtube: Drop phase 'fix-entry-points."

This reverts commit eee1ff3ae4.
This commit was intended for a different Python entry point
script template.

References: https://codeberg.org/guix/guix/pulls/5708

gnu/packages/video.scm

@@ -6899,6 +6899,14 @@ can also directly record to WebM or MP4 if you prefer.")
      (list
       #:phases
       #~(modify-phases %standard-phases
+          (add-after 'unpack 'fix-entry-points
+            (lambda _
+              (substitute* "setup.py"
+                ;; main.py is in a "mps_youtube" and not in
+                ;; "mps_youtube/main", see:
+                ;; <https://github.com/mps-youtube/yewtube/pull/1334>.
+                (("yt = mps_youtube:main.main")
+                 "yt = mps_youtube.main:main"))))
           (add-after 'unpack 'relax-requirements
             (lambda _
               (substitute* "mps_youtube/__init__.py"