remove "Remember Subject"

src/General/Config.coffee

@@ -305,10 +305,6 @@ Config =
         true
         'Open new threads or replies to a thread from the index in a new tab.'
       ]
-      'Remember Subject': [
-        false
-        'Remember the subject field, instead of resetting after posting.'
-      ]
       <% if (type === 'userscript') { %>
       'Remember QR Size': [
         false

src/Posting/QR.persona.coffee

@@ -68,6 +68,5 @@ QR.persona =
       persona =
         name:  post.name
         email: if /^sage$/.test post.email then persona.email else post.email
-        sub:   if Conf['Remember Subject'] then post.sub      else undefined
         flag:  post.flag
       $.set 'QR.persona', persona

src/Posting/QR.post.coffee

@@ -58,8 +58,6 @@ QR.post = class
 
       @sub = if 'sub' of QR.persona.always
         QR.persona.always.sub
-      else if Conf['Remember Subject']
-        if prev then prev.sub else persona.sub
       else
         ''