settings page not updating 'scale' attribute correctly on form submission:

[melippmann]

Describe the bug
The 'scale' selector lists 4 valid values '1, .75, .5, .25'
one can select all values and submit, however whenever the '.5' value is selected and submitted, the value displayed in the selector box is '1' however the database does seem to be updating with the correct value and the image is correctly scaled.

To Reproduce
Steps to reproduce the behavior:

1. ./manage.py runserver
2. navigate to the settings webpage
3. Scroll down to to 'scale'
4. select '.5'
5. click 'submit'
6. still on settings page scroll down to 'scale' and see that the number displayed is '1' not '.5'
7. navigate to 'home' page, see that video stream picture size is correctly scaled to '.5'

Expected behavior
The correct value should be displayed in the value box
Screenshots
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