Square images need scrolling down to be seen entirely

[e-platini]

For bounding box and landmark annotation style, untested for other styles.

When annotating, square images are displayed too big vertically and it is necessary to scroll to see the full image. This becomes an issue when needing to annotate a lot of images as it's slowing down the process. This happens regardless of the actual image size (the small images get scaled up).

I think this scales the images horizontally regardless of the size of the height of the image:

annotationweb/annotationweb/static/annotationweb/style.css

Lines 151 to 153 in c7d5bfe

	#canvas {
	width: 100%;
	}