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wifi: Roam more aggressively

Kristian Klausen requested to merge klausenbusk/NetworkManager:roam-threshold into master 
-80dBm is a very weak signal and we should roam sooner.
iwd[1] and iOS[2] default to -70dBm, Android[3] default to -73dBm.
So lets change the roaming threshold to -70dBm.

[1] https://git.kernel.org/pub/scm/network/wireless/iwd.git/commit/?id=45a51613c4c24067fe0e35b4c084a50124282b36  
[2] https://support.apple.com/en-us/HT203068  
[3] https://android.googlesource.com/platform/frameworks/base/+/68a4599a37e07745cbe0d441e29152da388b5baa/core/res/res/values/config.xml#609  
    https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/dacacbf69da8844232d938437b3b38471a3d2827/service/java/com/android/server/wifi/ScoringParams.java#218
    https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/dacacbf69da8844232d938437b3b38471a3d2827/service/java/com/android/server/wifi/ScoringParams.java#325
    https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/ee0920fb68d2f4447936301ce3192c345224e8e7/service/java/com/android/server/wifi/WifiNetworkSelector.java#149

Fix #201
Edited by Kristian Klausen

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