Don't parse a 'mailto:' into a lbry link.

## Issue
5130: Support mailto hyperlinks / urls in markdown

## Change
The markdown components already support mailto, just that the logic here ended up making it a 'ClaimLink'

ui/component/markdownLink/view.jsx

@@ -40,7 +40,7 @@ function MarkdownLink(props: Props) {
   } catch (e) {}
 
   let lbryUrlFromLink;
-  if (linkUrlObject) {
+  if (linkUrlObject && !href.startsWith('mailto:')) {
     const linkDomain = linkUrlObject.host;
     const isKnownAppDomainLink = KNOWN_APP_DOMAINS.includes(linkDomain);
     if (isKnownAppDomainLink) {