GDB Stub: correctly define the breakpoint type values

Read only and Write only were reversed, now they are properly defined.

Source/Core/Core/PowerPC/GDBStub.cpp

@@ -53,8 +53,8 @@ enum class BreakpointType
 {
   ExecuteSoft = 0,
   ExecuteHard,
-  Read,
   Write,
+  Read,
   Access,
 };