Change invalid host tests from '-' to '/'

src/event_id.rs

@@ -376,7 +376,7 @@ mod tests {
     #[test]
     fn invalid_event_id_host() {
         assert_eq!(
-            EventId::try_from("$39hvsi03hlne:-").err().unwrap(),
+            EventId::try_from("$39hvsi03hlne:/").err().unwrap(),
             Error::InvalidHost
         );
     }

src/room_alias_id.rs

@@ -213,7 +213,7 @@ mod tests {
     #[test]
     fn invalid_room_alias_id_host() {
         assert_eq!(
-            RoomAliasId::try_from("#ruma:-").err().unwrap(),
+            RoomAliasId::try_from("#ruma:/").err().unwrap(),
             Error::InvalidHost
         );
     }

src/room_id.rs

@@ -231,7 +231,7 @@ mod tests {
     #[test]
     fn invalid_room_id_host() {
         assert_eq!(
-            RoomId::try_from("!29fhd83h92h0:-").err().unwrap(),
+            RoomId::try_from("!29fhd83h92h0:/").err().unwrap(),
             Error::InvalidHost
         );
     }

src/user_id.rs

@@ -262,7 +262,7 @@ mod tests {
     #[test]
     fn invalid_user_id_host() {
         assert_eq!(
-            UserId::try_from("@carl:-").err().unwrap(),
+            UserId::try_from("@carl:/").err().unwrap(),
             Error::InvalidHost
         );
     }