ProviderViews: Improve Instagram’s “video thumbnail”

packages/@uppy/provider-views/src/style/uppy-ProviderBrowser-viewType--grid.scss

@@ -32,13 +32,13 @@
     }
   }
   li.uppy-ProviderBrowserItem--selected {
-    img, svg{
+    img, svg {
       opacity: 0.85;
     }
   }
   li.uppy-ProviderBrowserItem--noPreview {
     .uppy-ProviderBrowserItem-inner {
-      background-color: rgba($gray-500, 0.3);
+      background-color: rgba($gray-500, 0.2);
     }
     svg {
       fill: rgba($black, 0.7);
@@ -63,7 +63,7 @@
       outline: none;
       box-shadow: 0 0 0 3px rgba($blue, 0.9);
     }
-    img, svg {
+    img {
       width: 100%;
       height: 100%;
       object-fit: cover;