pbsplash: debug shell doesn't work properly

As written on Matrix:

Feels like pbsplash is a bit broken with debug-shell? seems to be related to long text where it cannot figure out line breaks. e.g. pbsplash -s /usr/share/pbsplash/pmos-logo-text.svg -b "foobar" -m "foobarfoobarfoobarfoobarfoobarfoobarfoobarfoobar" just hangs on FP4

pbsplash -s /usr/share/pbsplash/pmos-logo-text.svg -b "foobar" -m "foobar foobar foobar foobar foobar foobar foobar foobar" works fine

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