scribus-devel: use proper qt5.depends_component syntax

also set the required qt5 min version as per 20190427

print/scribus-devel/Portfile

@@ -6,6 +6,9 @@ PortGroup           cmake 1.1
 PortGroup           github 1.0
 PortGroup           qt5 1.0
 
+qt5.depends_component qttools qttranslations
+qt5.min_version     5.7.0
+
 set git_commit      5f77de1ad0af23e41d5014e711d9e2b957b1c534
 set git_date        20190404
 github.setup        scribusproject scribus ${git_commit}
@@ -62,8 +65,6 @@ depends_lib-append \
                     port:podofo \
                     port:poppler \
                     port:python27 \
-                    port:qt5-qttools \
-                    port:qt5-qttranslations \
                     port:tiff \
                     port:zlib