fix: EXPOSED-161 SQL Server syntax incorrectly allows CASCADE with dropSchema

Remove unused import

Author: bog-walk

exposed-tests/src/test/kotlin/org/jetbrains/exposed/sql/tests/shared/SchemaTests.kt

@@ -6,7 +6,6 @@ import org.jetbrains.exposed.sql.tests.DatabaseTestsBase
 import org.jetbrains.exposed.sql.tests.TestDB
 import org.jetbrains.exposed.sql.transactions.TransactionManager
 import org.jetbrains.exposed.sql.transactions.transaction
-import org.jetbrains.exposed.sql.vendors.OracleDialect
 import org.jetbrains.exposed.sql.vendors.SQLServerDialect
 import org.jetbrains.exposed.sql.vendors.currentDialect
 import org.junit.Assume