dm: fix filter to filters to match the field name used elsewhere

[yahonda]

What is changed, added or deleted? (Required)

"add a `filter` to the task configuration file of DM" uses the singular `filter`, but the field name is `filters` (plural) — as shown in the very next code block in this same file, and documented via the `#### `filters` {#filters}` heading in `dm/task-configuration-file-full.md`.

Source-code verification: `dm/config/task.go` defines the field as `Filters map[string]*bf.BinlogEventRule `yaml:"filters" toml:"filters" json:"filters"`` — confirming `filters` (plural) is the actual field name recognized by DM, in both the YAML task config and its TOML/JSON representations.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• 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)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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• filter-binlog-event.md

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