[SSR] Fix remaining `slot-not-at-top-level` tests

[nolanlawson]

These tests should be fixed:

    'slot-not-at-top-level/with-adjacent-text-nodes/lwcIf-as-sibling/light/index.js',
    'slot-not-at-top-level/with-adjacent-text-nodes/lwcIf/light/index.js',
    'slot-not-at-top-level/with-adjacent-text-nodes/if/light/index.js',
    'slot-not-at-top-level/with-adjacent-text-nodes/if-as-sibling/light/index.js',