accounting_l10n_fr: don't export lines with 0 quantity in FEC
"Test Compta Demat" complains about these https://github.com/DGFiP/Test-Compta-Demat/blob/1563a42a260e754a7543b2ee178d4300d1582db5/src/testeur/trt_txt.pl#L1023-L1033
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"Test Compta Demat" complains about these https://github.com/DGFiP/Test-Compta-Demat/blob/1563a42a260e754a7543b2ee178d4300d1582db5/src/testeur/trt_txt.pl#L1023-L1033
mentioned in commit 968c3f7b
·mentioned in commit 968c3f7b