AFC-21 Fixing error state and adding pause when prep goes false

[jimmyjon711]

Major Changes in this PR

• Fixing error state, error state will only be set to true when a pause is commanded. Made sure error state and pause variables get reset back to false when resume is called.
• Added logic to pause print when prep sensor goes false
• Had to add a check to make sure runout_lane was not blank
• Fixed other errors where functions were not referencing self.AFC

Notes to Code Reviewers

How the changes in this PR are tested

Tested with short filament so that it caused prep to de-active when filament passed the sensor

PR Checklist: (Checked-off items are either done or do not apply to this PR)

• I have performed a self-review of my code
• CHANGELOG.md is updated (if end-user facing)
• Sent notification to software-design channel requesting review

[MG-longshot]

i see no issues