install: declare installer_launch_hekate_payload for sub-menu exit

Made-with: Cursor

source/install.h

@@ -13,6 +13,9 @@ typedef enum {
     INSTALL_MODE_CLEAN     // No OmniNX - selective deletion from clean list
 } install_mode_t;
 
+// If a sub-menu aborts to Hekate / update.bin (does not return if launch succeeds)
+void installer_launch_hekate_payload(void);
+
 // Main installation function
 int perform_installation(omninx_variant_t pack_variant, install_mode_t mode);