main/ghostscript: fix secfixes comment for CVE-2019-6116

The compressed .tgz patch that was added in 9.26-r1 was never applied.
The issue was fixed in 9.26-r2.

ref #11914

fixes commit d674ed89 ({main,community}/*: remove duplicate CVEs)

main/ghostscript/APKBUILD

@@ -31,7 +31,6 @@ source="https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/
 #   9.26-r2:
 #     - CVE-2019-3835
 #     - CVE-2019-3838
-#   9.26-r1:
 #     - CVE-2019-6116
 #   9.26-r0:
 #     - CVE-2018-19409