fix(invoice): extend instance TTL after state changes

[abrcrmb]

This PR fixes issue #559 by ensuring that set_pool_contract, set_agent_registry_contract, set_escrow_contract, add_supported_asset, and remove_supported_asset call Self::extend_instance_ttl(&env) after writing to instance storage, keeping them consistent with other mutators.

Closes #559

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[mergekeeper]

Needs changes

Indentation and conditional control flow are broken in set_pool_contract and set_agent_registry_contract due to misplaced closing braces around Self::extend_instance_ttl(&env).

• contracts/invoice/src/lib.rs:165: Self::extend_instance_ttl(&env) is placed inside the else block with incorrect indentation and changes the control flow unexpectedly.
• contracts/invoice/src/lib.rs:237: Self::extend_instance_ttl(&env) is placed inside the else block with incorrect indentation and changes the control flow unexpectedly.

Reviewed commit: 42e7506a1521ab5caf6e2dcb60c3f34e688ae57e.

[mergekeeper]

Needs changes

Indentation and conditional control flow are broken in set_pool_contract and set_agent_registry_contract due to misplaced closing braces around Self::extend_instance_ttl(&env).

• contracts/invoice/src/lib.rs:165: Self::extend_instance_ttl(&env) is placed inside the else block with incorrect indentation and changes the control flow unexpectedly.
• contracts/invoice/src/lib.rs:237: Self::extend_instance_ttl(&env) is placed inside the else block with incorrect indentation and changes the control flow unexpectedly.

Reviewed commit: 42e7506a1521ab5caf6e2dcb60c3f34e688ae57e.