fix: false positives for mutable member in `svelte/no-immutable-reactive-statements` rule

[ota-meshi]

fixes #580

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Latest commit: cce972fe8037f0791322b87e757d63bebbbe41f9

The changes in this PR will be included in the next version bump.

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| Name | Type | | -------------------- | ----- | | eslint-plugin-svelte | Patch |

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