CFG: drop getObject from flow of singleton method

ql/src/codeql_ruby/controlflow/internal/ControlFlowGraphImpl.qll

@@ -1203,15 +1203,11 @@ module Trees {
 
   private class SingletonMethodTree extends RescueEnsureBlockTree, SingletonMethod {
     final override AstNode getChildNode(int i, boolean rescuable) {
-      result = this.getObject() and
+      result = this.getParameters() and
       i = 0 and
       rescuable = false
       or
-      result = this.getParameters() and
-      i = 1 and
-      rescuable = false
-      or
-      result = this.getChild(i - 2) and
+      result = this.getChild(i - 1) and
       rescuable = true
     }
 

ql/test/library-tests/controlflow/graph/Cfg.expected

@@ -50,7 +50,7 @@ cfg.rb:
 #-----|  -> String
 
 #  149| enter method
-#-----|  -> silly
+#-----|  -> SplatParameter
 
 #  153| enter two_parameters
 #-----|  -> a
@@ -1543,9 +1543,6 @@ cfg.rb:
 #  148| new
 #-----|  -> Call
 
-#  149| silly
-#-----|  -> SplatParameter
-
 #  149| SplatParameter
 #-----|  -> x