Able to skip levels by re-doing a previous one

[KatieWoe]

Test device
Dell
Operating System
Win 10
Browser
Chrome
Problem description
For phetsims/qa#506.
It is possible to skip a level by going back to a previous one and redoing it. Once the old level is re completed, the "go to the next level" prompt will come up, and it will create a new level past the uncompleted one.
Steps to reproduce

1. Complete Level one in a game and move to level two
2. Use the arrow to go back to level one
3. Use the yellow refresh level to start level one again
4. Complete level one again and choose to go to the next level.
5. You are now on level three without having done level two

Visuals

Troubleshooting information:

!!!!! DO NOT EDIT !!!!!
Name: ‪Build a Molecule‬
URL: https://phet-dev.colorado.edu/html/build-a-molecule/1.0.0-dev.75/phet/build-a-molecule_all_phet.html
Version: 1.0.0-dev.75 2020-06-01 13:20:12 UTC
Features missing: touch
Flags: pixelRatioScaling
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36
Language: en-US
Window: 1536x722
Pixel Ratio: 2.5/1
WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium)
GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium)
Vendor: WebKit (WebKit WebGL)
Vertex: attribs: 16 varying: 30 uniform: 4096
Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32)
Max viewport: 32767x32767
OES_texture_float: true
Dependencies JSON: {}

[Denz1994]

Great catch! The allFilledDialog has been fixed to only show if there isn't a nextCollection present on the currentCollection. This means we should only get the next collection prompt on the last collection (or level).

I'll post a dev version to verify.

[Denz1994]

This dev version can be used for verification.

[KatieWoe]

Looks good on that dev version

[Denz1994]

Thanks. Closing.