adding a read register in PPU write due to weird roms

sources/PPU/PPU.cpp

@@ -215,6 +215,8 @@ namespace ComSquare::PPU
 			this->_registers._setini.raw = data;
 			break;
 		//TODO adding the rest of the registers. oaf !
+		case ppuRegisters::stat77: // some roms write here but it is useless
+			break;
 		default:
 			throw InvalidAddress("PPU Internal Registers write", addr);
 		}