fix: syntax errors in openclaw-plugin test files

[jverdicc]

Motivation

• Tests in integrations/openclaw-plugin/tests failed to parse due to JavaScript syntax errors that prevented the test suite from running.
• These parsing issues blocked CI and local test validation, so the test files needed minimal syntactic fixes to restore correctness.

Description

• Added a missing catch (err) { throw err; } handler to the try block in integrations/openclaw-plugin/tests/plugin.e2e-daemon.test.js to satisfy the parser's requirement for try/catch/finally pairing.
• Removed a conflicting same-scope redeclaration and fixed the test block boundaries in integrations/openclaw-plugin/tests/plugin.test.js so plugin is no longer declared twice and the test closures are balanced.
• Ensured both edits are minimal and preserve the original test intent and assertions.

Testing

• Ran cd integrations/openclaw-plugin && npm ci which completed successfully.
• Ran cd integrations/openclaw-plugin && npm run check and npm run build, both completed without errors.
• Ran the test suite with cd integrations/openclaw-plugin && npm test and the tests passed (final combined run cd integrations/openclaw-plugin && npm ci && npm run check && npm run build && npm test returned EXIT:0).

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Codex Task