Fix previous commit, deinit screens on ARM9 exception, add check for write protect switch on writing operations

exceptions/arm9/source/mainHandler.c

@@ -116,7 +116,10 @@ void __attribute__((noreturn)) mainHandler(u32 *regs, u32 type)
     //Copy header (actually optimized by the compiler)
     *(ExceptionDumpHeader *)FINAL_BUFFER = dumpHeader;
 
+    i2cWriteRegister(I2C_DEV_MCU, 0x22, 1 << 0); //Shutdown LCD
+
     ((void (*)())0xFFFF0830)(); //Ensure that all memory transfers have completed and that the data cache has been flushed
+
     i2cWriteRegister(I2C_DEV_MCU, 0x20, 1 << 2); //Reboot
     while(true);
 }