weston: Properly namespace modules entrypoint

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/tests/surface-screenshot.c b/tests/surface-screenshot.c
index 6ff2bfc..716eeda 100644
--- a/tests/surface-screenshot.c
+++ b/tests/surface-screenshot.c
@@ -214,8 +214,8 @@
 }
 
 WL_EXPORT int
-module_init(struct weston_compositor *ec,
-	    int *argc, char *argv[])
+wet_module_init(struct weston_compositor *ec,
+		int *argc, char *argv[])
 {
 	weston_compositor_add_debug_binding(ec, KEY_H, trigger_binding, ec);