Revert 95ce6207

Quoting the KIconThemes change that lead to this change:

    Revert "Revert "Allow passing custom theme base path together with custom app themes""

    This reverts commit 6a75883159bbeb9a9316436d428d2617c3b5fc96.

    This was never intended to be pushed, it was a local test for the testcase
    in RR119058. Sorry for the mixup.

We're back to good now.

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