i18n(ja): restore literal FLUSH STATUS command name instead of a katakana transliteration

[yahonda]

What is changed, added or deleted? (Required)

In status-variables.md, the link anchor text for the FLUSH STATUS SQL statement was transliterated into katakana (フラッシュステータス) instead of keeping the literal SQL statement name, unlike every other reference to this command across the corpus (TOC entries, sql-statements/sql-statement-overview.md), which all keep it as literal SQL syntax FLUSH STATUS.

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• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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• Delete files
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