tippyjs: Combine "delegate" functions with same functionality.

This commits combines two different "delegate" functions that
provide identical functionality by combining values of the
"target" array in the function.

web/src/tippyjs.js

@@ -253,6 +253,7 @@ export function initialize() {
             "#scroll-to-bottom-button-clickable-area",
             ".code_external_link",
             ".spectator_narrow_login_button",
+            "#stream-specific-notify-table .unmute_stream",
         ],
         appendTo: () => document.body,
     });
@@ -266,11 +267,6 @@ export function initialize() {
         },
     });
 
-    delegate("body", {
-        target: "#stream-specific-notify-table .unmute_stream",
-        appendTo: () => document.body,
-    });
-
     delegate("body", {
         target: [
             ".rendered_markdown .copy_codeblock",