fix: remove extra encoding step

* URLSearchParams handles encoding the strings, so we were double
encoding it.

src/components/InstallButton.js

@@ -59,7 +59,7 @@ const createInstallLink = (
     });
   }
 
-  installUrl.searchParams.set('return_to', encodeURIComponent(platformUrl));
+  installUrl.searchParams.set('return_to', platformUrl);
   return installUrl.href;
 };