Support wide images in image popover

Fixed: 497728040
Change-Id: Iaffca150e1d502e1e8215da279d31e41a35beb2e
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7725746
Commit-Queue: Eric Leese <leese@chromium.org>
Auto-Submit: Philip Pfaffe <pfaffe@chromium.org>
Reviewed-by: Eric Leese <leese@chromium.org>

Author: pfaffe

front_end/ui/legacy/components/utils/imagePreview.css

@@ -12,7 +12,7 @@
 
 .image-preview-container img {
   margin: 6px 0;
-  max-width: 100px;
+  width: auto;
   max-height: 100px;
   background-image: var(--image-file-checker);
   user-select: text;