Top Search: handle view count for Repost (#736)

## Issue
Closes "87 Repost - Top result should show followers properly"

The winning url for "bret" search is "lbry://bret", which is a repost.

## Change
We need to use the canon url to retrieved the fetched view count.

ui/component/claimPreviewSubtitle/index.js

@@ -14,7 +14,7 @@ const select = (state, props) => {
     claim,
     pending: makeSelectClaimIsPending(props.uri)(state),
     isLivestream,
-    subCount: isChannel ? selectSubCountForUri(state, props.uri) : 0,
+    subCount: isChannel ? selectSubCountForUri(state, claim.repost_url ? claim.canonical_url : props.uri) : 0,
   };
 };