gnu: python-pyqt-4: Use 'modify-phases' syntax.

* gnu/packages/qt.scm (python-pyqt-4)[arguments]: Use 'modify-phases'
syntax.

gnu/packages/qt.scm

@@ -1084,8 +1084,8 @@ contain over 620 classes.")
        #:modules ((srfi srfi-1)
                   ,@%gnu-build-system-modules)
        #:phases
-         (alist-replace
-         'configure
+       (modify-phases %standard-phases
+         (replace 'configure
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))
                     (bin (string-append out "/bin"))
@@ -1104,8 +1104,7 @@ contain over 620 classes.")
                                "--confirm-license"
                                "--bindir" bin
                                "--destdir" lib
-                             "--sipdir" sip))))
-         %standard-phases)))
+                               "--sipdir" sip))))))))
     (license (list license:gpl2 license:gpl3)))) ; choice of either license
 
 (define-public python2-pyqt-4