fix(aggregator): short args removed

[aasseman]

Error was:

thread 'main' panicked at 'Command tap_aggregator: Short option names must be unique for each argument, but '-m' is in use by both 'mnemonic' and 'max_request_body_size''

Short arguments had to be removed as they clashed (-m). Short arguments are not required, so removal is the easy fix.

[github-actions[bot]]

🤖 Cargo Audit Report 🤖

(Empty means OK! 👍)

[coveralls]

Pull Request Test Coverage Report for Build 5526507047

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.117%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tap_aggregator/src/main.rs	0	4	0.0%
<!--	Total:	0	4	0.0%	-->

Totals
Change from base Build 5511523496:	0.0%
Covered Lines:	978
Relevant Lines:	1149

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