community/exim: remove duplicate CVE in secfixes comment

CVE-2018-6789 was fixed in 4.90.1.

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6789
#8505

ref #11914

community/exim/APKBUILD

@@ -35,7 +35,7 @@ builddir="$srcdir/$pkgname-$pkgver"
 #   4.91-r2:
 #     - CVE-2019-10149
 #     - CVE-2019-15846
-#   4.91-r0:
+#   4.90.1-r0:
 #     - CVE-2018-6789
 #   4.89-r5:
 #     - CVE-2017-1000369
@@ -43,8 +43,6 @@ builddir="$srcdir/$pkgname-$pkgver"
 #     - CVE-2017-16943
 #   4.89.1-r0:
 #     - CVE-2017-16944
-#   4.90.1-r0:
-#     - CVE-2018-6789
 
 prepare() {
 	default_prepare