native MEGA65 mode now runs with disabled hot registers (fixes IEC access)

src/kernal/screen_m65/mega65_scrmodeset.s

@@ -46,11 +46,15 @@ m65_scrmodeset_internal: // entry point for M65_MODE65
 
 	tax
 
+	jsr viciv_hotregs_on
+
 	lda m65_scrtab_scrolx,x
 	sta VIC_SCROLX
 	lda m65_scrtab_vic_ctrlb,x
 	sta VIC_CTRLB
 
+	jsr viciv_hotregs_off
+
 	// Set the logical row length to 80
 
 	ldx #$50