Remove ms-input placeholder, rely on autoprefixer

packages/@uppy/provider-views/src/style.scss

@@ -199,10 +199,6 @@
     vertical-align: text-top;
   }
 
-.uppy-ProviderBrowser-searchInput::-ms-input-placeholder {
-  color: $color-gray;
-}
-
 .uppy-ProviderBrowser-searchInput::placeholder {
   color: $color-gray;
 }