remove bad placeholder styles

media/css/legacy/main.css

@@ -373,10 +373,6 @@ input.long, textarea.long {
     width: 30em;
 }
 
-input.placeholder {
-    color: #444;
-}
-
 textarea {
     width: 100%;
     -moz-box-sizing: border-box;

media/css/zamboni/zamboni.css

@@ -3102,10 +3102,6 @@ label > .optional {
     margin-top: 2em;
 }
 
-input.placeholder {
-    color: #ccc;
-}
-
 table#addons-list, table#contributors-list {
     width: 100%;
 }