The "non standard parameters" warning doesn't show up after changing defaults in the developer mode

[julienw]

STR

1. Open the benchmark with ?developerMode
2. Open the developer menu
3. click "unselect all"
4. click "Perf-Dashboard"
5. click "Start tests"

Actual

After the run, the results are shown without any warning.

Expected

After the run, the results are shown with the warning for "non standard parameters".

Cc @camillobruni

[camillobruni]

Just noticed that we actually don't display a warning if custom URL params are used without the &developerMode param.