Match mailto: too

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -892,7 +892,7 @@ public class HtmlHelper {
             // geo:<lat>,<lon>[,<alt>][;u=<uncertainty>]
             // tel:<phonenumber>
             final Pattern pattern = Pattern.compile(
-                    PatternsCompat.AUTOLINK_EMAIL_ADDRESS.pattern() + "|" +
+                    "(((?i:mailto):)?" + PatternsCompat.AUTOLINK_EMAIL_ADDRESS.pattern() + ")|" +
                             PatternsCompat.AUTOLINK_WEB_URL.pattern()
                                     .replace("(?i:http|https|rtsp)://",
                                             "(((?i:http|https|rtsp|ftp|telnet|ssh|sftp|fish)://)|((?i:xmpp):))") + "|" +