Set default value of MaxBandwidth parameter to 1 GiB/s (#22996)

--- ./cfg/vnstat.conf
+++ ./cfg/vnstat.conf
@@ -41,7 +41,7 @@ RateUnit 1
 
 # maximum bandwidth (Mbit) for all interfaces, 0 = disable feature
 # (unless interface specific limit is given)
-MaxBandwidth 100
+MaxBandwidth 1000
 
 # interface specific limits
 #  example 8Mbit limit for eth0 (remove # to activate):