Corrected the height/thickness stackup in the extraction section of
the magic techfile to reflect the fact that there is no polyimide
layer on top of the whole chip, leading to a lower position of the
RDL layer.

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 9acc828..9e288ad 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -4939,8 +4939,8 @@
  height mimcc	     2.6661 0.12
  height mim2cc	     3.9311 0.09
 #ifdef REDISTRIBUTION
- height mrdlc	     6.6311 5.2523
- height mrdl	    11.8834 4.0
+ height mrdlc	     6.6311 0.63
+ height mrdl	     7.2611 3.0
 #endif (!REDISTRIBUTION)
 #endif (!METAL5)