feat: add a event for unset

contracts/core/LensHub.sol

@@ -965,7 +965,7 @@ contract LensHub is ILensHub, LensNFTBase, VersionedInitializable, LensMultiStat
         _defaultProfileByAddress[profileId] = address(0);
         _addressByDefaultProfile[owner] = 0;
 
-        emit Events.DefaultProfileSet(0, address(0), block.timestamp);
+        emit Events.DefaultProfileUnset(profileId, owner, block.timestamp);
     }
 
     function _createComment(DataTypes.CommentData memory vars) internal {

contracts/libraries/Events.sol

@@ -147,6 +147,19 @@ library Events {
      */
     event DefaultProfileSet(uint256 indexed profileId, address indexed wallet, uint256 timestamp);
 
+    /**
+     * @dev Emitted when a default profile is unset for a wallet as its main identity
+     *
+     * @param unsetProfileId The token ID of the profile for which the default profile is being unset from.
+     * @param wallet The wallet which owns this profile
+     * @param timestamp The current block timestamp.
+     */
+    event DefaultProfileUnset(
+        uint256 indexed unsetProfileId,
+        address indexed wallet,
+        uint256 timestamp
+    );
+
     /**
      * @dev Emitted when a dispatcher is set for a specific profile.
      *