Tweak mini: instead of zooming out the whole field, zoom out each individual

arrow, and push the columns together a bit.  It looks the same, except that it
doesn't cause arrows to be closer together, like increasing the scroll speed to
match.  This keeps mini from causing many more notes to be drawn.  In general,
effects should try to avoid needing to increase fDrawScale.

stepmania/src/NoteFieldPositioning.cpp

@@ -18,6 +18,10 @@ void NoteFieldMode::BeginDrawTrack( const PlayerState* pPlayerState, int iTrack
 	const Style *s = GAMESTATE->GetCurrentStyle();
 	// TODO: Remove indexing by PlayerNumber.
 	float fPixelXOffsetFromCenter = s->m_ColumnInfo[pPlayerState->m_PlayerNumber][iTrack].fXOffset;
+
+	const float* fEffects = pPlayerState->m_CurrentPlayerOptions.m_fEffects;
+	fPixelXOffsetFromCenter *= SCALE( fEffects[PlayerOptions::EFFECT_MINI], 0, 1, 1, 0.5f );
+
 	DISPLAY->Translate( fPixelXOffsetFromCenter, 0, 0 );
 }