Fixed error with locking in InterpreterDropQuery [#CLICKHOUSE-3959] #3038
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This error was introduced in #2260
lockForAlterwas changed tolockDataForAlterthat is incorrect.(It doesn't block SELECTs)
Probably it was done by mistake, because for the TRUNCATE itself,
lockDataForAlterlooks reasonable, as this query only modifies data.But for TRUNCATE table it is also incorrect.