fix(workspace): re-apply Expensify#89182 back-button handler simplification

PR Expensify#87283 (Submit workspace onboarding) was merged with a stale conflict
resolution that brought back the pre-Expensify#89182 multi-line onBackButtonPress
handler, effectively reverting the fix for Expensify#88970 ("Back button leads to
Inbox tab from workspace overview page"). Re-apply the one-liner so a
backTo route is always passed to Navigation.goBack().

Author: abzokhattab

src/pages/workspace/WorkspaceInitialPage.tsx

@@ -452,10 +452,7 @@ function WorkspaceInitialPage({policyDraft, policy: policyProp, route}: Workspac
             >
                 <HeaderWithBackButton
                     title={policyName}
-                    onBackButtonPress={() =>
-                        // On narrow, goBack() pops the workspace split; goBack with a route can't resolve inside TAB_NAVIGATOR.
-                        shouldUseNarrowLayout && !route.params?.backTo ? Navigation.goBack() : Navigation.goBack(route.params?.backTo ?? ROUTES.WORKSPACES_LIST.route)
-                    }
+                    onBackButtonPress={() => Navigation.goBack(route.params?.backTo ?? ROUTES.WORKSPACES_LIST.route)}
                     policyAvatar={policyAvatar}
                     shouldDisplayHelpButton={shouldUseNarrowLayout}
                 />