Remove unnecessary line-height property for .editor-rich-text-editable

This line height can be inherited with no negative effects. Removing this allows for less specific rules, making editor styles a bit easier.

packages/editor/src/components/rich-text/style.scss

@@ -7,7 +7,6 @@
 .editor-rich-text__editable {
 	margin: 0;
 	position: relative;
-	line-height: $editor-line-height;
 	// In HTML, leading and trailing spaces are not visible, and multiple spaces
 	// elsewhere are visually reduced to one space. This rule prevents spaces
 	// from collapsing so all space is visible in the editor and can be removed.