Auto merge of #29652 - switchpiggy:switchpiggy, r=jdm

Fixed bug where ./mach test-wpt was unable to run on windows due to servowpt…

….py not correctly setting default binary path

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Changed the default_binary_path variable to account for the binary_name change to "servo.exe" on win32 properly. Before, the target_dir was being changed after the default path variable was set. This would result in the following error when ./mach test-wpt was run:

"Binary path C:\Code\servo\target\release\servo does not exist"

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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- [x] These changes do not require tests because the validity of the change can be tested by running ./mach test-wpt.

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0 files changed, 0 insertions, 0 deletions