tbb-testsuite: fix the settings test
The settings test currently fails with the following error:
TEST-UNEXPECTED-FAIL | test_settings.py Test.test_settings | AssertionError: network.http.proxy.pipelining: None != True
layers.acceleration.disabled: False != True
network.http.pipelining.read-timeout: None != 60000
network.http.pipelining.reschedule-timeout: None != 15000
network.http.pipelining: None != True
security.enable_tls_session_tickets: None != False
network.http.spdy.enabled: True != False
network.http.pipelining.ssl: None != True
network.http.pipelining.aggressive: None != True
security.tls.version.max: 4 != 3
network.http.spdy.enabled.v3: None != False
network.http.spdy.enabled.v2: None != False
gfx.direct2d.disabled: None != True
network.http.pipelining.max-optimistic-requests: None != 3
network.http.pipelining.maxrequests: None != 12
webgl.min_capability_mode: False != True