Fix the SCANBIT macro by forcing it to use 32 bits

Naively using the "1 << n" shifting will default to 8 bits, because 1
fits in there. To make it 32-bit aware, not just by context (at which
point the damage may have already be done), force the "1" into a
uint32_t.

This silences the warnings, and also corrects the defines.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/Model01.h

@@ -48,7 +48,7 @@ class Model01 {
 
 };
 
-#define SCANBIT(row,col) (1 << (row * 8 + (7 - col)))
+#define SCANBIT(row,col) ((uint32_t)1 << (row * 8 + (7 - col)))
 
 #define R0C0  SCANBIT(0, 0)
 #define R0C1  SCANBIT(0, 1)