global_route.tcl: fix bug introduced when formatting code

This reverts a change from 5810f53

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/scripts/global_route.tcl

@@ -23,7 +23,7 @@ proc global_route_helper { } {
 
   if { $result != 0 } {
     if {
-      [!$::env(GENERATE_ARTIFACTS_ON_FAILURE) || \
+      [expr !$::env(GENERATE_ARTIFACTS_ON_FAILURE) || \
         ![file exists $::global_route_congestion_report] || \
         [file size $::global_route_congestion_report] == 0]
     } {