test: bayer-format: Rectify internal header's #include path

libcamera internal headers are not available system-wide. Hence,
directive `#include <libcamera/internal/header.h>` is wrong. Fix it
by using "" for the #include directive.

Fixes: e09c487b97 ("test: Add unit tests for the BayerFormat class")
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

test/bayer-format.cpp

@@ -7,9 +7,10 @@
 
 #include <iostream>
 
-#include <libcamera/internal/bayer_format.h>
 #include <libcamera/transform.h>
 
+#include "libcamera/internal/bayer_format.h"
+
 #include "test.h"
 
 using namespace std;