refactor(x/accounts): add sender assertions to SendModuleMessageUntyped

[sontrinh16]

Description

since SendModuleMessageUntyped does not invoke sendModuleMessage anymore, we need to do sender assertions here as well

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Summary by CodeRabbit

• Enhancements
  • Improved security by adding sender verification in the message sending process.

[coderabbitai]

Walkthrough

The update primarily enhances security in the Keeper struct's sendModuleMessageUntyped function by incorporating sender verification steps before the message router service is engaged. This change ensures that only valid senders can initiate message transmissions, bolstering the system's overall security and integrity.

Changes

File	Change Summary
x/.../keeper.go	Added sender assertions in the SendModuleMessageUntyped function to enhance security before routing messages.

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