🎨(frontend) remove space between PIN digits and # symbol

Update PIN formatting to remove space before the # symbol to clearly
indicate that # is part of the complete PIN code.

Improves user understanding that the hash symbol is an integral part
of the PIN entry sequence, not a separate element.

src/frontend/src/features/rooms/utils/telephony.ts

@@ -19,5 +19,5 @@ export const parseConfigPhoneNumber = (
 }
 
 export function formatPinCode(pinCode?: string) {
-  return pinCode && `${pinCode.replace(/(\d{3})(\d{3})(\d{4})/, '$1 $2 $3')} #`
+  return pinCode && `${pinCode.replace(/(\d{3})(\d{3})(\d{4})/, '$1 $2 $3')}#`
 }