Fix style settings for images in media modal (#4220)

* Shrink too wide single image modal

Fix too wide react-swipeable-view-container

Fix 0067f80 shrinking all react-swipeable-view-container

Change to apply max-width of react-swipeable-view-container only under media-modal.

Fix b30b03b just a typo

* Centering contents in image-loader

Centering small img, canvas, and video in image-loader.