Rasterizer/Textures: Fixed a bug where the I4 format would get twice the real stride.

Also added its name to the texture viewer widget

src/citra_qt/debugger/graphics_cmdlists.cpp

@@ -74,7 +74,7 @@ TextureInfoDockWidget::TextureInfoDockWidget(const Pica::DebugUtils::TextureInfo
     format_choice->addItem(tr("I8"));
     format_choice->addItem(tr("A8"));
     format_choice->addItem(tr("IA4"));
-    format_choice->addItem(tr("UNK10"));
+    format_choice->addItem(tr("I4"));
     format_choice->addItem(tr("A4"));
     format_choice->addItem(tr("ETC1"));
     format_choice->addItem(tr("ETC1A4"));

src/video_core/pica.h

@@ -200,6 +200,7 @@ struct Regs {
         case TextureFormat::IA8:
             return 4;
 
+        case TextureFormat::I4:
         case TextureFormat::A4:
             return 1;