Do update signal icon for -1 level in AddAppNetworksFragment
The level of a WifiEntry may be -1 (WIFI_LEVEL_UNREACHABLE) due to race conditions. Thus, only update the signal icon if the level is a valid value [0, 4] Bug: 201488249 Test: m Change-Id: I87f1c108d262bb5a7575c9ad434d2cfb953134af (cherry picked from commit 9d66b22e)
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