fix #18990 Regression in proc symbol resolution; Error: attempting to… (#20554)

fix #18990 Regression in proc symbol resolution; Error: attempting to call routine

tests/constr/a.nim

@@ -0,0 +1,2 @@
+type A* = object
+  a: uint8

tests/constr/b.nim

@@ -0,0 +1,2 @@
+type B* = object
+proc A*(a, b: float): B = discard

tests/constr/t18990.nim

@@ -0,0 +1,3 @@
+import a, b
+discard A(1f, 1f) # works
+proc x(b = A(1f, 1f)) = discard # doesn't work