Revert "implement new lua method: tastudio.createnewbranch()"

This reverts commit 601f56c.

Author: YoshiRulz

src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/TAStudioLuaLibrary.cs

@@ -753,19 +753,5 @@ public string OnBranchRemove(LuaFunction luaf, string name = null)
 			}
 			return "";
 		}
-
-		[LuaMethodExample("""
-			tastudio.createnewbranch();
-		""")]
-		[LuaMethod(
-			name: "createnewbranch",
-			description: "creates a new branch at the current frame")]
-		public void CreateNewBranch()
-		{
-			if (Engaged())
-			{
-				Tastudio.Branch();
-			}
-		}
 	}
 }

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs

@@ -1318,7 +1318,5 @@ public void LoadBranch(TasBranch branch)
 			StopSeeking();
 			RefreshDialog();
 		}
-
-		public void Branch() => BookMarkControl.Branch();
 	}
 }