Revert "E-mail subject truncation is over-eager"

This reverts commit b4dae5e1a0c34f7f781a73b9f3313c8478dba4f6

The truncation failed when the subject length was 59,
throwing StringIndexOutOfBoundsException and causing
email formatting to abort with no message sent.
diff --git a/gerrit-server/src/main/resources/com/google/gerrit/server/mail/ChangeSubject.vm b/gerrit-server/src/main/resources/com/google/gerrit/server/mail/ChangeSubject.vm
index bb3c127..a67c38c 100644
--- a/gerrit-server/src/main/resources/com/google/gerrit/server/mail/ChangeSubject.vm
+++ b/gerrit-server/src/main/resources/com/google/gerrit/server/mail/ChangeSubject.vm
@@ -32,6 +32,6 @@
 ## subject line for ALL emails related to changes.
 ##
 #macro(elipses $length $str)
-#if(($str.length()+3) > $length)${str.substring(0,$length)}...#else$str#end
+#if($str.length() > $length)${str.substring(0,$length)}...#else$str#end
 #end
 Change in $projectName.replaceAll('/.*/', '...')[$branch.shortName]: #elipses(60, $change.subject)