Theming for arrow back on search field while on light mode

[kibettheophilus]

When you click the search field while in light mode, the back icon is not visible.

Steps to reproduce

• Switch between dark mode and light mode
• Observe the back icon on the search input field(replaces search icon)

Expected behavior

The back icon won't be visible while on dark mode because the theme color is overridden by default provided in layout

Actual behavior

Environment

• Android Version: 10
• raywenderlich.com App Version: 1.3.0-debug
• Device: Xiaomi Redmi 9A

[KelvnPere]

As soon as the merge conflict is resolved, this can be closed.

Cc @wangerekaharun