manifest: Update west manifest for LVGL glue code move

Updates the west manifest to move the LVGL glue code back into the zephyr
main repository.

Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>

west.yml

@@ -260,7 +260,7 @@ manifest:
       revision: ce57712f3e426bbbb13acaec97b45369f716f43a
       path: modules/lib/loramac-node
     - name: lvgl
-      revision: 5da257f782a8f9c6e265bdc60ebc2a93fdee24de
+      revision: pull/45/head
       path: modules/lib/gui/lvgl
     - name: lz4
       revision: 8e303c264fc21c2116dc612658003a22e933124d