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Re-enables the BrowserMinidumpTest tests on Linux and the CrOS amd64
emulator, as the flakiness that caused them to be disabled should be
properly attributed to the correct test now that pre/post test minidump
checking has been enabled.

Also fixes the test failing locally under certain GN arg configurations
that caused the crash signature to change a bit.

Bug: 1056235
Change-Id: I74c7407e8ded26652cf8fa833c5e11bd2dca9f4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2118576
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#753135}