[Nativescript 7] TextField rounded style is broken #276

Environment

• CLI: 7.0.7
• Android Runtime: 6.5.3, 7.0.0

Describe the bug
-rounded class doesn't work over TextFields in Nativescript 7.0.0.

To Reproduce
Simple example:

<StackLayout class="nt-form">
    <TextField hint="Rounded" class="-rounded m-t-10"></TextField>
</StackLayout>

Expected behavior
The rounded TextField should look like rounded buttons (the same as rounded TextFields before Nativescript 7)

Sample project
https://github.com/mohammadrafigh/ns-theme-issue