SED STACKER - normalization parameters in GUI are still bound incorrectly

[jbudynk]

PR #130 didn't fix all the normalization parameter binding issues. The issue was first brought up in #64, then #115. The main issue is this:

I have two stacks, Stack.A and Stack.B. I set Stack.A's parameters first:

Stack.A

• multiply
• norm type: integration
• normalization range: -Infinity to Infinity, in Angstroms
• normalize to: Average, in Jy

Then, I switch to Stack.B and set the parameters:

Stack.B

• multiply
• norm type: integration
• normalization range: -Infinity to Infinity, in Angstroms
• normalize to: Value, 1.0 erg/s/cm2

When I switch back to Stack.A, the Normalize to: Y-Units goes back to erg/s/cm2.