Correct the dbu in FreePDK45.lyt

Fixes The-OpenROAD-Project#3591

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/platforms/nangate45/FreePDK45.lyt

@@ -2,7 +2,7 @@
 <technology>
  <name>FreePDK45</name>
  <description>FreePDK45 (and Nangate45) Technology</description>
- <dbu>0.0001</dbu>
+ <dbu>0.0005</dbu>
  <base-path>./platforms/nangate45/</base-path>
  <original-base-path>.klayout/tech/FreePDK45/</original-base-path>
  <layer-properties_file>FreePDK45.lyp</layer-properties_file>