use clientSecret in login flow

src/components/login_form/login_form.js

@@ -26,9 +26,10 @@ const LoginForm = {
       this.isTokenAuth ? this.submitToken() : this.submitPassword()
     },
     submitToken () {
-      const { clientId } = this.oauth
+      const { clientId, clientSecret } = this.oauth
       const data = {
         clientId,
+        clientSecret,
         instance: this.instance.server,
         commit: this.$store.commit
       }

src/components/oauth_callback/oauth_callback.js

@@ -4,10 +4,11 @@ const oac = {
   props: ['code'],
   mounted () {
     if (this.code) {
-      const { clientId } = this.$store.state.oauth
+      const { clientId, clientSecret } = this.$store.state.oauth
 
       oauth.getToken({
         clientId,
+        clientSecret,
         instance: this.$store.state.instance.server,
         code: this.code
       }).then((result) => {