Color Picker bugs.

[mattheu]

1. .wp-color-result.wp-picker-open has top: 0, causing a 1px jump when opening/closing.
2. in the new 3.8 UI - the text in the field is larger and overflows the fixed with of this field. It would be nicer to reduce the text size so it fits.

3. When used outside of the theme customizer, the input field .wp-color-picker has no styling.

To recreate 3. Create a text input and use the JS like so: jQuery('input.my-colorpicker').wpColorPicker();

This patch

1. applies top: 0 to .wp-color-result(open and closed)
2. Reduces text size in hex-value field
3. Moves hex-value-field styles to main customizer styles.

[iammattthomas]

In 26435:

Design fixes to the color picker:

• Apply top: 0 to .wp-color-result (open and closed).
• Reduce text size in hex-value field.
• Move hex-value-field styles to color-picker.css.

Fixes #26289, props mattheu.