remove unnecessary select border reset

docs/assets/css/bootstrap.css

@@ -1135,10 +1135,6 @@ input[type="file"] {
   line-height: 34px;
 }
 
-select {
-  border: 1px solid #cccccc;
-}
-
 select[multiple],
 select[size] {
   height: auto;

less/forms.less

@@ -138,12 +138,6 @@ input[type="file"] {
   line-height: @input-height-base;
 }
 
-// Make select elements obey height by applying a border
-// TODO: See if this can be part of the above selector stack
-select {
-  border: 1px solid @input-border;
-}
-
 // Make multiple select elements height not fixed
 select[multiple],
 select[size] {