fix #20002 (#20004)

While this fix seems innocent,
this unlocks the hidden behavior of
method calls not being able to call
gensym'ed routines inside templates.

tests/template/tinnerouterproc.nim

@@ -0,0 +1,8 @@
+block: # #20002
+  proc bar(x: int): int = 10
+  template foo =
+    proc bar(x: int): int {.gensym.} = x + 2
+    doAssert bar(3) == 5
+    discard 3.bar # evaluates to 10 but only check if it compiles for now
+  block:
+    foo()