**Remove redundant session cleanup in WebSocket error handlers**

Removed unnecessary `removeSession` calls from WebSocket `finally` blocks as they are either handled elsewhere or no longer needed. This simplifies the error handling flow and ensures consistency across WebSocket route implementations.

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSSongListRoutes.kt

@@ -151,8 +151,6 @@ fun Routing.wsSongListRoutes() {
             }
         } catch (e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
-        } finally {
-            removeSession(uid)
         }
     }
 

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSSongRoutes.kt

@@ -110,8 +110,6 @@ fun Routing.wsSongRoutes() {
             }
         } catch(e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
-        } finally {
-            removeSession(uid, this)
         }
     }
 

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSTimerRoutes.kt

@@ -87,8 +87,6 @@ fun Routing.wsTimerRoutes() {
             }
         } catch(e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
-        } finally {
-            removeSession(uid, this)
         }
     }