Unify appearance of close handle in .modal and .alert-message

[nikku]

Change .modal-header .close in patterns.less from

  .close {
    position: absolute;
    right: 10px;
    top: 10px;
    color: #999;
    line-height:10px;
    font-size: 18px;
  }

to the .alert-message .close style

  .close {
   position: absolute;
    right: 10px;
    top: 10px;
    color: @black;
    line-height:10px;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 0 1px 0 rgba(255,255,255,1);
    .opacity(20);
    &:hover {
      color: @black;
      text-decoration: none;
      .opacity(40);
    }

to make both look similar to each other.

[mdo]

Nice, good catch. I've abstracted .close outside of the popover and the .alert-message aside from a bit of positioning for the .modal. Now it can be used everywhere—yay!

Will be released with 1.3.