ctest: Honor preset binaryDir for initial configuration

Prior to this commit, ctest would sometimes use the current working directory
as its binary directory rather than honoring `binaryDir` from a configure
preset. This would occur when using ctest in dashboard client mode to perform
an initial configuration with a preset.

  `ctest --source-dir=<dir> -T Configure -D CTEST_PRESET=<preset>`

An explicit `--build-dir` still takes precedence over the preset's `binaryDir`.