Fix comment box color and text input

[himanshugoyal77]

Description

Fixes #223 #222 #221

1.The color on comment box was set to default which is blue. and it was not matching with the theme of the app. Making it look odd.
2.the text field was not getting cleared after submitting the comment.

Type of change

Changed the focus color or primary color and added code to clear the input text.

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Tested on ios and android app

Please include screenshots below if applicable.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes Input text doesn't get cleared when submit button is pressed #223 Comment box style not matching with theme #222 Snackbar messages provides technical jargon that might not be user-friendly or helpful to end-users #221 (Replace xxxx with the GitHub issue number)
• Ui changes