gauge thermometer PR fixes

[gayanSandamal]

Description

Screen.Recording.2024-10-23.at.18.14.38.mov

Related Issue(s)

#1203

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[gayanSandamal]

#1410 (comment)

It looks a little too cartoon-like at the moment. To be consistent with the other widget-types, we should not have a gradient in the fill, the border should be the same color as the fill, and there should be a gap between the border and fill. I would also like to see the remova of the border radius at the top of the fill so it reads as a gauge easier.

@joepavitt this PR contains the required fixes. Unfortunately this doesn't allow me to add anyone as reviewers at the moment.

[joepavitt]

Thanks @gayanSandamal