Minecraftforge: [1.13.2] Other mods' Access Transformers not applied while in a deobf environment

[Tamaized]

Discovered this while debugging:
https://github.com/mezz/JustEnoughItems/issues/1512#issuecomment-473707301

To reiterate, I had placed a breakpoint here:
https://github.com/MinecraftForge/AccessTransformers/blob/2b9c7950bfd2e6b654fde244b789727eefaa8bc1/src/main/java/net/minecraftforge/accesstransformer/AccessTransformerEngine.java#L34
And I've noticed fn.name shows a mapped name while fieldTransformers contains all srg names (obviously) thus checking against .containsKey(fn.name) will always fail.
As shown here: https://cdn.discordapp.com/attachments/418125698486632448/556912816930684932/unknown.png

I did a test where instead of srg names in the dependency accesstransformer.cfg file, I used mapped names instead. Tossed the new test jar into my workspace and had no issues whatsoever.

[cpw]

I'll look at this next time I'm home. Sadly that's likely a week from now :rage:

[cpw]

I already have infrastructure in place to try and help solve this.

[cpw]

Closing, implemented in cdbd84249495e1385e2657fca986229779dd0efc