Fix styles for text area and number field

[m-orlova]

QA notes

Can be checked in Flowset Control:

1. Text area - Process instances -> Select mulitple items -> Click Terminate button. Component for the reason should look like as other input fields (borderd with white background color, not grey background color).
2. Number field - Process instance -> Open detail view -> Variables tab -> Click Create button -> Select Integer type. Component for the value should look like as other input fields (borderd with white background color, not grey background color).