HxSearchBox - fix clear button padding if there is delete icon

[vaclavek]

• Add css class hx-search-box-input-with-clear-icon if there is clear button.
• Add right padding if there is new css class

Fixes #505

[hakenr]

lgtm

[crdo]

@vaclavek if you want to be precise the padding is slightly different for each size (Small, Regular, Large).

[vaclavek]

@crdo I have added more input sizes to test page and checked padding on all sizes. The distance of text from X is now same as distance X from right border.
Everything is bathed in sunlight now :)