Apply buttons panel's specific styles to simple pagination only if the pagination component is not inside a slot

[glebfox]

Simple pagination inside the hbox's endSlot will be correctly end-aligned and there is no need in custom styles.

For example:

<hbox classNames="buttons-panel">
    <startSlot>
        <button text="Button"/>
    </startSlot>

    <endSlot>
        <button text="Button"/>
        <simplePagination dataLoader="usersDl"/>
    </endSlot>
</hbox>

AR:

ER:

[SergeiAksenov2]

Tested on:
Jmix version: 2.7.999-SNAPSHOT
Jmix Studio Plugin Version: 2.7.SNAPSHOT8028-252
IntelliJ version: IntelliJ IDEA 2025.2.5 (Community Edition)