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/CurrentTimeClient.h

@@ -5,7 +5,7 @@
 #undef max
 #undef min
 #include <cstdint>
-#include "BleClient.h"
+#include "components/ble/BleClient.h"
 
 namespace Pinetime {
   namespace Controllers {