applications: matter_bridge: Remove unused constant

Remove unused constant - kMaxBufferSize.

Signed-off-by: Adrian Gielniewski <[email protected]>

Author: adigie

samples/matter/common/src/bridge/bridge_storage_manager.h

@@ -247,8 +247,6 @@ class BridgeStorageManager {
 	bool RemoveBtAddress(uint8_t bridgedDeviceIndex);
 #endif
 
-	static constexpr auto kMaxBufferSize = sizeof(MatterBridgedDevice);
-
 	Nrf::PersistentStorageNode mBridge;
 	Nrf::PersistentStorageNode mBridgedDevicesCount;
 	Nrf::PersistentStorageNode mBridgedDevicesIndexes;