Rename UE4Games.uprojectdirs to Default.uprojectdirs.
New naming is meant to reflect (a) that we're not UE4 any more, and (b) that these are the default locations to check for .uproject files rather than anything game-specific. Anyone with this file open in UGS may need to reopen the project with the renamed file.
#rnx
#jira UE-143953
#rb
#preflight 621ce783d815cc2f95e5e21c
#ROBOMERGE-AUTHOR: ryan.hummer
#ROBOMERGE-SOURCE: CL 19174184 in //UE5/Release-5.0/... via CL 19174320
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v921-19075845)
[CL 19174430 by ryan hummer in ue5-main branch]
