Allow attribution flag to resize with font-size

The 🇺🇦 flag does currently not scale with font-size changes unlike the rest of the attribution.

width: 1em and height: auto should be sufficient in allowing the flag to resize with font-size changes.

Though em is not supported in IE 6-9, so perhaps something like the following is required:

var ukrainianFlag = '<svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="12" height="8"
+ viewBox="0 0 12 8
">

.leaflet-control-attribution svg {
	display: inline !important;
+	width: 1em;
+	height: auto;
	}

The CSS takes precedence over the presentational attributes, allowing the flag to resize in relation to font-size in browsers that support em units.

[Falke-Design]

run npm run watch and then open /debug/map/map-mobile.html

[sumitsaurabh927]

I’ll get started in this! Thanks for assigning me!