fix: fixes USR_STR using old binary constant format

Author: boriel

src/arch/zx48k/library-asm/usr_str.asm

@@ -30,7 +30,7 @@ USR_STR:
 
     inc hl
     ld a, (hl) ; Only the 1st char is needed
-    and 11011111b ; Convert it to UPPER CASE
+    and %11011111 ; Convert it to UPPER CASE
     sub 144   ; CODE(UDG "A")
     jr nc, CONT
     add a, 144   ; It was a letter
@@ -71,4 +71,3 @@ USR_ERROR:
     ENDP
 
     pop namespace
-

src/arch/zxnext/library-asm/usr_str.asm

@@ -30,7 +30,7 @@ USR_STR:
 
     inc hl
     ld a, (hl) ; Only the 1st char is needed
-    and 11011111b ; Convert it to UPPER CASE
+    and %11011111 ; Convert it to UPPER CASE
     sub 144   ; CODE(UDG "A")
     jr nc, CONT
     add a, 144   ; It was a letter
@@ -71,4 +71,3 @@ USR_ERROR:
     ENDP
 
     pop namespace
-