fix: double-slash in api calls due to domain to url conversion (#48)

skymoth sends //api/v1/apps to my server, which is not correctly handled by either my reverse proxy or GoToSocial.

lib/utils.ts

@@ -29,7 +29,7 @@ export async function fetchImageToBytes(url: string) {
 }
 
 export function domainToUrl(domain: string) {
-    return `https://${domain}/`
+    return `https://${domain}`
 }
 
 export function genCallBackUrl(instanceDomain: string) {
@@ -86,4 +86,4 @@ export function checkValidHttpsUrl(rwaUrl: string): boolean {
     } catch (err) {
         return false;
     }
-}
+}