style: fix style error of login page (#1901)

Co-authored-by: liuyao <liuyao@liuyaodeiMac.local>

src/views/sys/login/LoginForm.vue

@@ -63,7 +63,7 @@
           {{ t('sys.login.qrSignInFormTitle') }}
         </Button>
       </ACol>
-      <ACol :md="7" :xs="24">
+      <ACol :md="6" :xs="24">
         <Button block @click="setLoginState(LoginStateEnum.REGISTER)">
           {{ t('sys.login.registerButton') }}
         </Button>