Fix alpha sprite support

Detail:
  s/Wimp01 - An ill-advised last minute edit would leave the Wimp in an infinite loop looking for ROM sprites if it tried to enable alpha sprite support
Admin:
  Tested on BB-xM


Version 5.34. Retagged as 'Wimp-5_34'

s/Wimp01

@@ -4236,7 +4236,7 @@ getromsprites
         LDRNEB  R0,alphaspriteflag
         CMP     R0,#255                         ; If alpha sprites supported
         CMPEQ   R5,R6                           ; And square pixel mode
-        MOVEQ   R5,#'A'                         ; Look for alpha version
+        MOVEQ   R5,#'A'-'0'                     ; Look for alpha version
       ]
 
         ADD     R14,R5,R6,LSL #8