pandas/network.py: fix typo in finding fhr #2167

Job	Run time
test (3.8, 1)	11m 59s
test (3.8, 2)	10m 35s
test (3.8, 3)	11m 50s
test (3.8, 4)	14m 13s
test (3.9, 1)	11m 35s
test (3.9, 2)	11m 32s
test (3.9, 3)	10m 42s
test (3.9, 4)	12m 7s
Merge and update test durations	18s
	1h 34m 51s

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