gnu: go-github-com-gdamore-tcell-v2: Simplify package.

There are no any *.gz files in output for the package, this change
removes unnecessary custom phase.

* gnu/packages/golang.scm (go-github-com-gdamore-tcell-v2) [name]:
Adjust it to follow naming style for Glang module variants.
[phases]<phases>: Remove 'make-file-writable.

Change-Id: I1c20b769d1d5426ff4ce36d07764284ac29228dd

gnu/packages/golang.scm

@@ -4515,7 +4515,7 @@ systems.")
 (define-public go-github-com-gdamore-tcell-v2
     (package
       (inherit go-github-com-gdamore-tcell)
-      (name "go-github-com-gdamore-tcell")
+      (name "go-github-com-gdamore-tcell-v2")
       (version "2.7.4")
       (source (origin
                 (method git-fetch)
@@ -4527,15 +4527,7 @@ systems.")
                  (base32
                   "05b22sgyf8lnwjddxlfvlj7i8b67gnidhbnz86vvx8fddggpa5nd"))))
       (arguments
-       (list #:import-path "github.com/gdamore/tcell/v2"
+       (list #:import-path "github.com/gdamore/tcell/v2"))
-             #:phases
-             #~(modify-phases %standard-phases
-                 (add-before 'reset-gzip-timestamps 'make-files-writable
-                   (lambda _
-                     ;; Make sure .gz files are writable so that the
-                     ;; 'reset-gzip-timestamps' phase can do its work.
-                     (for-each make-file-writable
-                               (find-files #$output "\\.gz$")))))))
       (propagated-inputs
        (modify-inputs (package-inputs go-github-com-gdamore-tcell)
          (prepend go-golang-org-x-term go-golang-org-x-sys)))))