fix : corrected blank_row_from_bottom formula in Number-Sliding-Puzzle is_solvable

[tmdeveloper007]

Summary of What Has Been Done

Corrected the blank_row_from_bottom calculation in games/Number-Sliding-Puzzle/Number-Sliding-Puzzle.py to use blank_row_from_top + 1 instead of 3 - blank_row_from_top, ensuring the row-from-bottom value correctly reflects 1=bottom, 2=middle, 3=top.

Changes Made

• Changed blank_row_from_bottom = 3 - blank_row_from_top to blank_row_from_bottom = blank_row_from_top + 1
• Updated the inline comment to correctly reflect the semantic: 1=bottom, 2=middle, 3=top

Impact it Made

• Ensures the solvability check uses semantically correct row-from-bottom values
• Aligns the variable name with its actual computed value

Closes #1844

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