fix(whale-api): Fix swap tx not found index (#2170) #8403

Job	Run time
Lint	1m 43s
Build	2m 44s
Test (0)	13m 39s
Test (1)	13m 35s
Docker Buildx (linux/amd64, legacy-api)	1m 8s
Test (2)	12m 4s
Docker Buildx (linux/amd64, playground-api)	1m 20s
Docker Buildx (linux/amd64, status-api)	1m 8s
Test (3)	15m 32s
Docker Buildx (linux/amd64, whale-api)	1m 15s
Test (4)	9m 36s
Test (5)	13m 36s
Test (6)	6m 13s
Test (7)	9m 29s
Test (8)	15m 27s
Test (9)	5m 50s
Docker Sanity Test	4m 34s
	2h 8m 53s

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