Fix "pool not found" after the new rescan when oracle token in a box without R4 defined (filter oracle box properly)

[greenhat]

Close #256

[coveralls]

Pull Request Test Coverage Report for Build 4665391522

• 0 of 4 (0.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 60.318%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/main.rs	0	1	0.0%
core/src/oracle_state.rs	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
core/src/oracle_state.rs	1	0%

Totals
Change from base Build 4638148482:	0.05%
Covered Lines:	2049
Relevant Lines:	3397

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💛 - Coveralls