lvtinydom: fix compiler warning [-Wunused-private-field]

[benoit-pierre]

With the int maxLen private field of ldomTextCollector removed, the int maxTextLen arguments to ldomTextCollector(…) and to ldomXRange::getRangeText can also be removed.

Note: calls to getRangeText in cre.cpp will need to be updated.

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This change is 

[poire-z]

Any idea when the maxLen stopped being used (if it ever was used) ? (Maybe you know about a localized git log trick :))
(If it was ever me that removed it, dunno if it was on purpose and a good idea, we could return 36Mb of text :))

[benoit-pierre]

It looks like it was added in 3cd5ec4, and never used.