[FIX] l10n_ke_edi_tremol: discount sign #162193
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When sending an invoice with negative discount, the code responsible for serialising this discount applies a '+' plus sign to the discount. This is because the DiscAddP (Discount Addition Percentage) field on the device expects a negative amount for discounts (with a minus sign).
However, due to errors with our own device, we have detected that surcharges (or negative discounts), serialised with a '+' plus sign actually trigger an error on the fiscal device (5 Input registers overflow).
This commit adapts the serialisation to specify no sign in the case of negative discounts (surcharges), since a non-negative number in this field serves as a representation of a surcharge. Trailing zeros are stripped from the value and tests are updated to coincide with this change.