ghc: use canonical case for hscolour dep

Author: jmroot

lang/ghc/Portfile

@@ -213,7 +213,7 @@ if {${name} eq ${subport}} {
                     port:gzip \
                     port:hadrian \
                     port:happy \
-                    port:HsColour \
+                    port:hscolour \
                     port:python${python3_version} \
                     port:py${python3_version}-sphinx \
                     port:texlive-fonts-extra \
@@ -236,7 +236,7 @@ if {${name} eq ${subport}} {
                     alex \
                     hadrian \
                     happy \
-                    HsColour
+                    hscolour
 
     post-extract {
         xinstall -d ${workpath}/bin