OPNSense/core 4a4d72asrc/etc config.xml.sample, src/etc/inc system.inc

system: bootstrap a default value and always apply #3806

So that users are not seeing issues because they haven't done a
config reset yet.  It also allows us to bump the default again
if needed.
DeltaFile
+1-1src/etc/config.xml.sample
+2-0src/etc/inc/system.inc
+3-12 files

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