Debugger: Fix evaluation of function declarations with expression bodies (KT-32704)

Before this commit, the substituted FunctionDescriptor didn't have a source element.
As a result, 'CodeFragmentParameterAnalyzer.isCodeFragmentDeclaration' failed to recognize such a descriptor as fragment-local, and it was erroneously captured.

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/FunctionDescriptorImpl.java

@@ -328,7 +328,12 @@ public abstract class FunctionDescriptorImpl extends DeclarationDescriptorNonRoo
         if (originalSubstitutor.isEmpty()) {
             return this;
         }
-        return newCopyBuilder(originalSubstitutor).setOriginal(getOriginal()).setJustForTypeSubstitution(true).build();
+
+        return newCopyBuilder(originalSubstitutor)
+                .setOriginal(getOriginal())
+                .setPreserveSourceElement()
+                .setJustForTypeSubstitution(true)
+                .build();
     }
 
     @Nullable