Update/react native colours to variables #22985
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Description
This PR tries to fix wordpress-mobile/gutenberg-mobile#1783
By updating the hard coded colours with sass variables.
How has this been tested?
TBD
Screenshots
Floating tool bar (Spacer bar colour):

Before:
After: notice that the spacer bar matches the colour of the arrow.

Types of changes
Updated of the code to use the currently supplied sass colour variables.
Checklist: