Remove "What's This?" leftovers

[husamalhomsi]

A follow-up to #4128.

[husamalhomsi]

I got excited when I saw whatsthis.png and removed them thoughtlessly, turns out they are used somewhere. 😅

[husamalhomsi]

I believe this is it and there is nothing left.

[PhysSong]

I got excited when I saw whatsthis.png and removed them thoughtlessly, turns out they are used somewhere. 😅

It's here:

lmms/src/core/DataFile.cpp

Lines 1498 to 1510 in 84d1091

	TextFloat::displayMessage(
	SongEditor::tr( "Version difference" ),
	SongEditor::tr(
	"This %1 was created with "
	"LMMS %2."
	).arg(
	_sourceFile.endsWith( ".mpt" ) ?
	SongEditor::tr( "template" ) :
	SongEditor::tr( "project" )
	)
	.arg( root.attribute( "creatorversion" ) ),
	embed::getIconPixmap( "whatsthis", 24, 24 ),
	2500

We may rename it instead if needed.

[husamalhomsi]

We may rename it instead if needed.

I think it's fine as-is. Let it be a vestige of the extinct feature. 😄

[husamalhomsi]

Merge?