fix: align frozen-band cell-cleanup ranges with the (inclusive) render ranges

[ghiscoding]

Port bug fix from 6pac/SlickGrid PR 6pac/SlickGrid#1259 into slickgrid-universal

The bug

render()'s frozen-band cleanUpAndRenderCells ranges used bottom = getDataLength() (frozenBottom) / frozenRow (top mode), while the frozen renderRows ranges directly below use getDataLength() - 1 / frozenRow - 1. Both are consumed as inclusive row ranges, so the cleanup pass overshot by one row: in top mode the first scrollable row (index frozenRow) was processed by both the frozen pass and the main pass of the same render() call. (In bottom mode the overshoot index equals getDataLength(), which is never cached, so it was skipped.)

The fix

Two-token change aligning the cleanup bounds with the render bounds, so the invariant cleanup range == render range actually holds.

Why no new test

There is no user-observable effect to pin: the double-processed boundary row's cleanup and render are idempotent within a single render() call, so pre-fix and post-fix DOM are identical — this removes redundant work and a latent correctness hazard, not a visible symptom. A 'repro' test would pass on both sides and be worthless. Non-regression is covered by the existing frozen-row suites (ran frozen-rows / frozen-columns-and-rows / frozen spreadsheet locally, 22/22 green).

Part of the quirks-triage series:
6pac/SlickGrid#1255
6pac/SlickGrid#1256
6pac/SlickGrid#1257
6pac/SlickGrid#1258

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (15d9833) to head (7c38a03).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2674   +/-   ##
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  Coverage   100.0%   100.0%           
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  Files         200      200           
  Lines       25452    25452           
  Branches     8999     8999           
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  Hits        25452    25452           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: 7c38a03