Fix shrinked horizontal separator (#9192)

Related issue:
https://discord.com/channels/1130383047699738754/1317185369577492532/1317185369577492532.

TL;DR: When used in a flex container, the separators gets hidden when
the container becomes scrollable. We must ensure they can't shrink.

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/auth/sign-in-up/components/SignInUpGlobalScopeForm.tsx

@@ -106,7 +106,7 @@ export const SignInUpGlobalScopeForm = () => {
         {authProviders.google && <SignInUpWithGoogle />}
         {authProviders.microsoft && <SignInUpWithMicrosoft />}
         {(authProviders.google || authProviders.microsoft) && (
-          <HorizontalSeparator visible />
+          <HorizontalSeparator />
         )}
         {/* eslint-disable-next-line react/jsx-props-no-spreading */}
         <FormProvider {...form}>

packages/twenty-front/src/modules/auth/sign-in-up/components/SignInUpWorkspaceScopeForm.tsx

@@ -37,7 +37,7 @@ export const SignInUpWorkspaceScopeForm = () => {
           workspaceAuthProviders.microsoft ||
           workspaceAuthProviders.sso.length > 0) &&
         workspaceAuthProviders.password ? (
-          <HorizontalSeparator visible />
+          <HorizontalSeparator />
         ) : null}
 
         {workspaceAuthProviders.password && <SignInUpWithCredentials />}