internal/report: fix MITRE link

Add "www" to MITRE link prefix so that the link displayed in
"cve publish" works.

Change-Id: I5d066e301b7d39addbc6cfa104576d855beb253b
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/455858
Auto-Submit: Tatiana Bradley <tatiana@golang.org>
Run-TryBot: Tatiana Bradley <tatiana@golang.org>
Reviewed-by: Tatiana Bradley <tatiana@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>

internal/report/report.go

@@ -216,7 +216,7 @@ func (r *Report) GetAliases() []string {
 
 const (
 	NISTPrefix    = "https://nvd.nist.gov/vuln/detail/"
-	MITREPrefix   = "https://cve.org/CVERecord?id="
+	MITREPrefix   = "https://www.cve.org/CVERecord?id="
 	ghsaURLPrefix = "https://github.com/advisories/"
 	goURLPrefix   = "https://pkg.go.dev/vuln/"
 )