[LEBV-297] Enable/disable buttons when there isn't videoinput
🎯 Summary
🧪 How to test
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Repeat the steps documented here: !46 (merged) but in the branch 'LEBV-297-continue_button'.
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In the step 2 and 3 you should see something similar to the attached images when the user does not have a videocamera:
- The "Continue" button is enabled (Step 2).
- The videocall option is disabled (Step 3).
🧠 Considerations
🧐 Checklist
- Changes work in Google Chrome
- Changes work in Safari
- UI is responsive

