tests: runtime: add another case where if/else fails with compound statements

test/runtime/samples/if-block-component-store-function-conditionals/Widget.svelte

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+<p>OK</p>

test/runtime/samples/if-block-component-store-function-conditionals/_config.js

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+export default {
+	html: '<p>OK</p>',
+};

test/runtime/samples/if-block-component-store-function-conditionals/main.svelte

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+<script>
+	import {writable} from 'svelte/store';
+	import Widget from './Widget.svelte';
+	let a = (writable({}));
+	let b = () => true;
+</script>
+{#if $a || b() }
+		<Widget></Widget>
+{:else}
+	<pre>fail</pre>
+{/if}