do not show 'previous' button in last step

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/features/ui/components/modals/report-modal/report-modal.tsx

@@ -204,7 +204,7 @@ const ReportModal = ({ onClose }: IReportModal) => {
       title={<FormattedMessage id='report.target' defaultMessage='Reporting {target}' values={{ target: <strong>@{account.acct}</strong> }} />}
       onClose={onClose}
       cancelText={cancelText}
-      cancelAction={cancelAction}
+      cancelAction={currentStep === Steps.THREE ? undefined : cancelAction}
       confirmationAction={handleNextStep}
       confirmationText={confirmationText}
       confirmationDisabled={isConfirmationButtonDisabled}