Remove the extra parameters field from the PH.

[Linktothepast]

Metroid: Other M was the only game which required this field, but the
issue in that game can be fixed properly by enabling format change
emulation. Hence, there's no point in having this around anymore.
Fixes issue 6644.

[delroth]

LGTM.

[neobrain]

You'll also want to change:

• VideoCommon/VideoConfig.cpp: CHECK_SETTING("Video", "PH_ExtraParam", iPhackvalue[3]);

• VideoCommon/VideoConfig.h int iPhackvalue[4] => iPhackvalue[3]

• VideoCommon/VertexShaderManager.cpp: Remove all of these:

  static bool g_ProjHack3;
  ....
  bool bProjHack3 = false;
  ...
  
  sTemp[0] = "DISABLED";
  bProjHack3 = (iPhackvalue[3] == 1) ? true : bProjHack3;
  if (bProjHack3)
      sTemp[0] = "ENABLED";
  NOTICE_LOG(VIDEO, "- Extra Parameter: %s", sTemp[0]);
  ...
  g_ProjHack3 = bProjHack3;
  ...
  g_fProjectionMatrix[15] = (g_ProjHack3 && rawProjection[0] == 2.0f ? 0.0f : 1.0f);  //causes either the efb copy or bloom layer not to show if proj hack enabled
  

The last line can be changed to g_fProjectionMatrix[15] = 1.0f;.

[Linktothepast]

@neobrain OK, done + remove a comment that is no longer necessary.

[neobrain]

Alright, now the two commits just need to be squashed and it's good to go :)