fix #19443: some objects missing from repeats palette

With this Segno, Segno Variation, Coda, Coda Variation and Codetta show on the repeats palette again.
There's something odd about their sizes though (Segno Variation too small, the Codas slightly too big) and also Codetta doesn't look quite right (being constructed using 2 Codas), maybe a new glyph is needed for Codetta.
The size issue can get solved by setting the cell properties to their defaults.