Correct FullNodeDiscovery.pending_tasks typo without s

[altendky]

Purpose:

To actually do what the line was meant to.

Current Behavior:

New Behavior:

Testing Notes:

[coveralls-official]

Pull Request Test Coverage Report for Build 6604893412

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 95 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.09%) to 90.077%

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Files with Coverage Reduction	New Missed Lines	%
chia/harvester/harvester_api.py	1	73.02%
chia/server/node_discovery.py	1	78.01%
chia/full_node/full_node.py	2	85.97%
chia/timelord/timelord_api.py	2	87.85%
chia/server/server.py	6	81.07%
chia/full_node/full_node_api.py	7	77.24%
chia/wallet/wallet_node.py	7	87.14%
chia/timelord/timelord_state.py	20	69.47%
chia/timelord/timelord.py	49	73.64%

Totals
Change from base Build 6592270821:	-0.09%
Covered Lines:	93065
Relevant Lines:	103265

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💛 - Coveralls

[wjblanke]

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