[FIX] stock_landed_costs: splitting and decimals

When splitting landed costs against the picking line, the decimal
precision was not taken into account.

For example: with a landed cost of 5.01 split equally over two lines,
the cost for each line is 2.505 which is rounded to 2.51 with a decimal
precision of the fractional part of 2. Hence the total was wrongly of
5.02 (which is an issue when wanted to validate the landed costs).

With this commit, the split landed costs are restrained to stay under
the whole landed cost price.

closes #6882
fixes #5568
opw-639503

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