whb/gfx: Capitalise v in WHBGfxGetTVColourBuffer

All the other public whb/gfx functions capitalise DRC and TV, so do that 
here.

libraries/libwhb/include/whb/gfx.h

@@ -93,7 +93,7 @@ BOOL
 WHBGfxFreeTexture(GX2Texture *texture);
 
 GX2ColorBuffer *
-WHBGfxGetTvColourBuffer();
+WHBGfxGetTVColourBuffer();
 
 GX2DepthBuffer *
 WHBGfxGetTVDepthBuffer();

libraries/libwhb/src/gfx.c

@@ -542,7 +542,7 @@ WHBGfxFinishRenderTV()
 }
 
 GX2ColorBuffer *
-WHBGfxGetTvColourBuffer()
+WHBGfxGetTVColourBuffer()
 {
    return &sTvColourBuffer;
 }