Always use ucid for channel search

src/invidious.cr

@@ -2521,11 +2521,7 @@ get "/channel/:ucid" do |env|
   end
 
   if !auto_generated
-    if author.includes?(" ") || author.includes?("-")
-      env.set "search", "channel:#{ucid} "
-    else
-      env.set "search", "channel:#{author.downcase} "
-    end
+    env.set "search", "channel:#{ucid} "
   end
 
   if auto_generated

src/invidious/search.cr

@@ -53,12 +53,12 @@ alias SearchItem = SearchVideo | SearchChannel | SearchPlaylist
 def channel_search(query, page, channel)
   client = make_client(YT_URL)
 
-  response = client.get("/user/#{channel}?disable_polymer=1&hl=en&gl=US")
+  response = client.get("/channel/#{channel}?disable_polymer=1&hl=en&gl=US")
   document = XML.parse_html(response.body)
   canonical = document.xpath_node(%q(//link[@rel="canonical"]))
 
   if !canonical
-    response = client.get("/channel/#{channel}?disable_polymer=1&hl=en&gl=US")
+    response = client.get("/c/#{channel}?disable_polymer=1&hl=en&gl=US")
     document = XML.parse_html(response.body)
     canonical = document.xpath_node(%q(//link[@rel="canonical"]))
   end