Take a reserved row in account

Andrei Kortunovrequested to merge
akortunov/lua-multimark:features/reserved_line into master

A "List Length" feature's description shows that "How many location marks are shown in a list. Default is 10.". But the last row is reserved for statistics, so with value 10 you will get up to 9 marks, not 10.

I suppose that we can just reserve an additional line to match the description.

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