ui5-button's styles are broken in sap_belize theme

[georgimkv]

Bug Description

The button's styles are broken in the SAP Belize theme.

Steps to Reproduce

1. Go to https://sap.github.io/ui5-webcomponents/master/playground/main/pages/Button/?sap-ui-theme=sap_belize

Context

• UI5 Web Components version: latest

Priority

• Low
• Medium
• High
• Very High

The priority indicates the severity of the issue. To set the appropriate priority consider the following criteria:

• Breaks entire application or system - High or Very High
• Accessibility issue - Medium or High
• Functional issue - Medium or High
• Visual issue - Low or Medium

Note: The priority might be re-evaluated by the issue processor.
I believe broken CSS styles in this way suffice for at least High priority.

[georgimkv]

Hi @SAP/ui5-webcomponents-topic-b. Would you take a look? Looks like an issue with the parameters/css bundle of the theme.