Change default slider velocity for new beatmaps to match osu!stable

[peppy]

This is the default in osu!stable (ie. on creating a new beatmap in the editor) and plays better than 1.0.

[peppy]

!diffcalc

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1S6qrf-U-LwgUqzue8tzYOqW-1n9g54UhmEvJ5KZzW7s/edit

[peppy]

!diffcalc
RULESET=taiko

[peppy]

!diffcalc
RULESET=catch

[peppy]

!diffcalc
RULESET=mania

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1EW0xo2SFwW2aoxTkgJ43zN0bA3wdVb2fGB5_SqgmzVs/edit

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1EACZSaNsxeucZf98g2_Q_iAWfHp42Bb7b7bdfeVgHCE/edit

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1VrCSngDWRt5fiMIzQbOdaDhIQfrsk1IJixZpi_ZXbFg/edit

[bdach]

This part seems likely to be fine, although I will hold out for the diffcalc results. Stable appears to be behaving similarly based on a little debugging.

[bdach]

taiko is showing differences, but the diffcalc run is for whatever reason comparing with a month-old rev (1a86366) and we've had other changes to taiko since then, most notably the drumroll length fixes which are likely to be the real culprit for this. For one the star ratings reported as mismatched on the sheet match on latest master.

[bdach]

I found the place that pinned the diffcalc sheet generator to the old rev and modified it to hopefully always use latest, so gonna queue up a rerun of the taiko one now...

!diffcalc
RULESET=taiko

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1gDWyctmoY3qR7dNnbO7Opq7KEgAgLb7gcNIH833s5aM/edit

[bdach]

Just for my peace of mind gonna re-run mania too, since I noticed SR changes there as well...

!diffcalc
RULESET=mania

[github-actions]

Target: #25688
Spreadsheet: https://docs.google.com/spreadsheets/d/1kFy7rUaal-cNny1uMLKULrvtOB1724hUR2rGHCzXN8Y/edit