Fix display error in some lot usage schedule displays

[jmcameron]

PR https://github.com/IMA-WorldHealth/bhima/pull/5918 fixed most problems with the lot usage schedule displays. Unfortunately, at least one issue remains. The calculations involved seem correct and the displays all seem to work okay on @jmcameron's computer. Unfortunately, one fails on @jniles' computer.

However, this one works on @jmcameron's computer:

See the comment in PR 5918 for a little more detail.

This is using the Vanga database, looking at inventory article: Sonde Naso Gastrique 10 [130-622]