long window: incorrect result for pure history window

**Bug Description**

https://github.com/4paradigm/OpenMLDB/blob/b44617e0300fc2f2ca8ed6a8df5bd70d5a8c488d/hybridse/src/vm/runner.cc#L2915

current row always count into window agg even for pure history window

**Expected Behavior**

**Steps to Reproduce**

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The bug is in hybridse/src/vm/runner.cc at line 2915, where the current row is incorrectly counted in a pure history window aggregation. Start by examining the window aggregation logic around that line and the definition of a pure history window. Look for existing tests related to window functions to understand the expected behavior. Verify the fix by running relevant unit or integration tests in the codebase.

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