#12818: remove escaping of () in quoted strings in formataddr

The quoting of ()s inside quoted strings is allowed by the RFC, but is not
needed.  There seems to be no reason to add needless escapes.
diff --git a/Lib/email/utils.py b/Lib/email/utils.py
index aecea65..138f05d 100644
--- a/Lib/email/utils.py
+++ b/Lib/email/utils.py
@@ -55,7 +55,7 @@
 TICK = "'"
 
 specialsre = re.compile(r'[][\\()<>@,:;".]')
-escapesre = re.compile(r'[][\\()"]')
+escapesre = re.compile(r'[\\"]')