[PivotGrid] remove / replace styles for the Configurator component

[PaskalevStoyan]

Some of the styles for the Configurator component in the PivotGrid are messing with the Drag&Drop functionality for the Chips inside it. The Drag&Drop functionality is not working well with margin rather than padding.

The following styles can be changed:

• give .k-form .k-chip-list width:100%
• replace the margin-top with padding-top in .k-form .k-form-field
• .k-form.k-form-horizontal .k-form-field and .k-form.k-form-horizontal .k-chip-list should have padding-top: 0 and padding-left: 16px / remove the padding-left from .k-form.k-form-horizontal .k-form-field-wrapper
• k-settings-description should have padding-top instead of margin-top