fix: typo 'nonrebase_cotract' -> 'nonrebase_contract' in tests

[phessophissy]

Fixes typo in test variable names where "contract" was misspelled as "cotract" (missing 'n').

Files changed:

• contracts/test/_fixture.js (28 occurrences)
• contracts/test/token/ousd.js (5 occurrences)
• contracts/test/token/token-transfers.js (24 occurrences)

Variables renamed:

• nonrebase_cotract_0 → nonrebase_contract_0
• nonrebase_cotract_1 → nonrebase_contract_1
• nonrebase_cotract_notSet_0 → nonrebase_contract_notSet_0
• nonrebase_cotract_notSet_1 → nonrebase_contract_notSet_1
• nonrebase_cotract_notSet_altcpt_gt_0 → nonrebase_contract_notSet_altcpt_gt_0
• nonrebase_cotract_notSet_altcpt_gt_1 → nonrebase_contract_notSet_altcpt_gt_1

[naddison36]

We have some big PRs waiting to be merged into master so we'll hold off merging this trivial PR until the high priority ones are merged.