Neuter the PlayerOptions Practice Mode option

basically this causes some issues
these changes stop it from being relevant at all (not considered in copies, saves, loads)
it will still appear in mod strings

src/Etterna/Models/Misc/PlayerOptions.cpp

@@ -140,7 +140,6 @@ PlayerOptions::Approach(const PlayerOptions& other, float fDeltaSeconds)
 	for (int i = 0; i < NUM_TRANSFORMS; i++)
 		DO_COPY(m_bTransforms[i]);
 	DO_COPY(m_bMuteOnError);
-	DO_COPY(m_bPractice);
 	DO_COPY(m_FailType);
 	DO_COPY(m_MinTNSToHideNotes);
 	DO_COPY(m_sNoteSkin);
@@ -994,7 +993,6 @@ PlayerOptions::operator==(const PlayerOptions& other) const
 	COMPARE(m_FailType);
 	COMPARE(m_MinTNSToHideNotes);
 	COMPARE(m_bMuteOnError);
-	COMPARE(m_bPractice);
 	COMPARE(m_fDark);
 	COMPARE(m_fBlind);
 	COMPARE(m_fCover);
@@ -1046,7 +1044,6 @@ PlayerOptions::operator=(PlayerOptions const& other)
 	CPY(m_FailType);
 	CPY(m_MinTNSToHideNotes);
 	CPY(m_bMuteOnError);
-	CPY(m_bPractice);
 	CPY_SPEED(fDark);
 	CPY_SPEED(fBlind);
 	CPY_SPEED(fCover);
@@ -1223,7 +1220,6 @@ PlayerOptions::GetSavedPrefsString() const
 	SAVE(m_bTransforms[TRANSFORM_NOLIFTS]);
 	SAVE(m_bTransforms[TRANSFORM_NOFAKES]);
 	SAVE(m_bMuteOnError);
-	SAVE(m_bPractice);
 	SAVE(m_sNoteSkin);
 	SAVE(m_fAppearances[APPEARANCE_HIDDEN]);
 	SAVE(m_fAppearances[APPEARANCE_HIDDEN_OFFSET]);