fix: tests: Stop converting boolean key to int

Conversion only happens when parsing a bandwidth file in the
integration tests.

Closes: #40009

docs/source/classes_original.puml

@@ -30,7 +30,7 @@ class Relay {
   int @p average_bandwidth
   int @p burst_bandwidth
   int @p consensus_bandwidth
-  int @p consensus_bandwidth_is_unmeasured
+  bool @p consensus_bandwidth_is_unmeasured
   obj _from_ns(attr)
   obj _from_desc(attr)
   bool can_exit_to_port(int port)
@@ -217,4 +217,4 @@ class State {
   get()
 }
 
-@enduml
\ No newline at end of file
+@enduml

sbws/lib/v3bwfile.py

@@ -260,6 +260,8 @@ BWLINE_INT_KEYS = (
     + BWLINE_KEYS_V1_2
     + BWLINE_KEYS_V1_4
 )
+# This is boolean, not int.
+BWLINE_INT_KEYS.remove('consensus_bandwidth_is_unmeasured')
 
 
 def round_sig_dig(n, digits=PROP276_ROUND_DIG):