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/components/ble/ImmediateAlertService.cpp

@@ -1,6 +1,6 @@
-#include "ImmediateAlertService.h"
+#include "components/ble/ImmediateAlertService.h"
 #include <cstring>
-#include "NotificationManager.h"
+#include "components/ble/NotificationManager.h"
 #include "systemtask/SystemTask.h"
 
 using namespace Pinetime::Controllers;