fix: change button to submit button for Send Test Email form

modules/setting-management/src/Volo.Abp.SettingManagement.Blazor/Pages/SettingManagement/EmailSettingGroup/EmailSettingGroupViewComponent.razor

@@ -158,7 +158,7 @@
                     </ModalBody>
                     <ModalFooter>
                         <Button Color="Color.Secondary" Clicked="CloseSendTestEmailModalAsync">@L["Cancel"]</Button>
-                        <Button Color="Color.Primary" Clicked="SendTestEmailAsync">@L["Send"]</Button>
+                        <SubmitButton Form="SendTestEmailForm" Clicked="SendTestEmailAsync">@L["Send"]</SubmitButton>
                     </ModalFooter>
                 </Form>
             </ModalContent>