Auto merge of #10363 - autrilla:issue#10357, r=emilio
Auto merge of #10363 - autrilla:issue#10357, r=emilio

Issue #10357: mach run -b now passes additional params to servo

Previously `./mach run` with the `-b` flag set ignored everything passed after the `--`, so for example when running `./mach run -d -b -- --help`, `--help` was not passed to servo - it is now.

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