Issue #3501808 by tr: Remove config schema for the votingapi_widgets module

Closes #3501808

config/schema/votingapi_widgets.schema.yml

-field.storage_settings.voting_api_field:
-  type: mapping
-  label: 'Voting API widget field settings.'
-  mapping:
-    vote_plugin:
-      type: string
-      label: 'Vote plugin'
-    vote_type:
-      type: string
-      label: 'Vote type'
-    status:
-      type: string
-      label: 'Status'
-
-field.field_settings.voting_api_field:
-  type: mapping
-  label: 'Voting API widget field settings.'
-  mapping:
-    anonymous_window:
-      type: string
-      label: 'Anonymous vote rollover'
-    result_function:
-      type: string
-      label: 'Result function'
-    user_window:
-      type: string
-      label: 'Registered user vote rollover'
-    widget_format:
-      type: string
-      label: 'Widget format'
-
-field.value.voting_api_field:
-  type: mapping
-  label: 'Default value'
-  mapping:
-    status:
-      type: string
-      label: 'Status'