Use the new icon for bluetooth connection

Ismael Asensiorequested to merge
work/iasensio/bluetooth-network-icon into master

The icon network-wireless-bluetooth represents better the concept of network connection via bluetooth, and doesn't get confused with the regular bluetooth icon

BEFORE AFTER
nm-applet-bt-before.png nm-applet-bt-after.png

CC: @mdelafuente

BUG: 409417 FIXED-IN: 6

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