remove some hardcoded screen names

stepmania/Themes/default/metrics.ini

@@ -182,6 +182,7 @@ TimerStealth=0
 StyleIcon=1
 MemoryCardIcons=1
 NextScreen=ScreenSelectGroup
+PrevScreen=ScreenTitleBranch
 SilentWait=1
 BounceJoinMessage=1
 FoldOnJoin=1
@@ -300,6 +301,7 @@ CharacterIconP2OffCommand=linear,0.3;diffusealpha,0;sleep,10
 
 [ScreenStyleSplash]
 NextScreen=ScreenSelectGroup
+PrevScreen=ScreenTitleBranch
 StyleIcon=0
 MemoryCardIcons=0
 TimerSeconds=0
@@ -920,6 +922,7 @@ NoSongsScreen=ScreenTitleBranch
 Fallback=ScreenWithMenuElements
 
 [ScreenEz2SelectMusic]
+PrevScreen=ScreenTitleBranch
 UseModeSwitcher=0
 BalloonX=SCREEN_CENTER_X+172
 BalloonY=SCREEN_CENTER_Y-100
@@ -2248,6 +2251,7 @@ Line4=list,RandomModifiers
 
 [ScreenEditCoursesMenu]
 Fallback=ScreenWithMenuElements
+NextScreen=ScreenTitleBranch
 ExplanationX=SCREEN_CENTER_X+0
 ExplanationY=SCREEN_CENTER_Y+170
 ExplanationOnCommand=wrapwidthpixels,900;zoom,0.7
@@ -3311,6 +3315,7 @@ PlayerP1OnePlayerTwoSidesX=SCREEN_CENTER_X
 PlayerP2OnePlayerTwoSidesX=SCREEN_CENTER_X
 
 [EditMenu]
+PrevScreen=ScreenTitleBranch
 Arrows1X=SCREEN_CENTER_X-130
 Arrows2X=SCREEN_CENTER_X+270
 SongBannerX=SCREEN_CENTER_X+170
@@ -3868,6 +3873,8 @@ RandomModifiersDefault=mod,clear
 RandomModifiers,1=name,Off
 RandomModifiers,2=mod,random;name,Random
 
+[ScreenReloadSongs]
+NextScreen=ScreenTitleBranch
 
 [DancingCharacters]
 #2D Character X/Y positions in relation to the center