fix: biomass tests from memote

[BenjaSanchez]

Description of the issue:

From the latest memote report, the following biomass tests are giving unexpected results:

• Biomass consistency = 0
• GAM is not detected (the test errors) is detected
• Unrealistic Growth Rate In Default Condition = true false
• Ratio of Direct Metabolites in Biomass Reaction = 0.7 0.14
• Number of Missing Essential Biomass Precursors = 37 30

Many of these tests failing may be a result of an improper detection of our biomass pseudoreaction as "clustered", i.e. separated into protein pseudoreaction, lipid pseudoreaction, etc.

More relevant info at opencobra/memote#243

I hereby confirm that I have:

• Tested my code with all requirements for running the model
• Checked that a similar issue does not exist already
• If needed, asked first in the Gitter chat room about the issue

[ChristianLieven]

Unrealistic Growth Rate In Default Condition = true is likely a bug in memote, I've seen it a couple of times now in models which should be fine. I'll have to dig around more to pinpoint the cause though!