update hover text to be 'Delete' in the confirm deletion buttons in ProviderTableRow and OrganizationTableRow

ui/src/admin/components/chronograf/OrganizationsTableRow.js

@@ -111,6 +111,7 @@ class OrganizationsTableRow extends Component {
               onConfirm={this.handleDeleteOrg}
               onClickOutside={this.handleDismissDeleteConfirmation}
               confirmLeft={true}
+              confirmHoverText="Delete"
             />
           : <OrganizationsTableRowDeleteButton
               organization={organization}

ui/src/admin/components/chronograf/ProvidersTableRow.js

@@ -109,6 +109,7 @@ class ProvidersTableRow extends Component {
               onCancel={this.handleDismissDeleteConfirmation}
               onConfirm={this.handleDeleteMap}
               onClickOutside={this.handleDismissDeleteConfirmation}
+              confirmHoverText="Delete"
             />
           : <button
               className="btn btn-sm btn-default btn-square"