add a flush after every PDDB write

uncommitted data will lead to corruption later on

Author: bunnie

emulation/peripherals/MXIC_MX66UM1G45G.cs

@@ -692,6 +692,7 @@ private void WriteToMemory(byte val)
                 tmp_byte[0] = val;
                 InternalBackingFile.Seek(position, SeekOrigin.Begin);
                 InternalBackingFile.Write(tmp_byte, 0, 1);
+                InternalBackingFile.Flush();
             }
         }