Update includes to to be relative to src directory

Don't use relative imports like `../foo.h` as those depend on the
relative position of both files. Rather than that use imports relative
to the `src` directory, which explicitly is part of the include
directories.

src/displayapp/DisplayAppRecovery.h

@@ -11,10 +11,10 @@
 #include <drivers/Watchdog.h>
 #include <components/motor/MotorController.h>
 #include "BootErrors.h"
-#include "TouchEvents.h"
-#include "Apps.h"
-#include "Messages.h"
-#include "DummyLittleVgl.h"
+#include "displayapp/TouchEvents.h"
+#include "displayapp/Apps.h"
+#include "displayapp/Messages.h"
+#include "displayapp/DummyLittleVgl.h"
 
 namespace Pinetime {
   namespace Drivers {