Corrected a problem introduced in a recent commit that causes
parts of poly layers to disappear from the layout on GDS read-in,
in particular narrow areas of poly like the extension beyond
transistors.

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 95d6a51..8b76ede 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -3078,6 +3078,8 @@
  and-not TAP
  and-not RPM
  and-not URPM
+
+ templayer polycontarea polyarea
  # Remove areas too small for a contact
  shrink 130
  grow 130