Fix mysql migration script of 1.9.20#309

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kenchan0130 wants to merge 1 commit intoTestLinkOpenSourceTRMS:testlink_1_9_20_fixedfrom

kenchan0130:fix-migration-1.9.20

Commits on May 20, 2021

Match because the type did not match during migration in 1.9.20.
kenchan0130
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