Fix locale-dependent regex bug in BSR_INSTALL path parsing

[LisanAlGaib-Mahdi]

Changed -match to -cmatch for the BSR_INSTALL regex in Resolve-LauncherPaths.

On certain regional Windows locales, PowerShell's case-insensitive -match converts the uppercase "I" incorrectly. Because this converted character is not in the [A-Z] range, the regex fails and breaks the root process by returning an empty path.

Making it case-sensitive with -cmatch is a safe, simple fix that solves this issue permanently for all international users without affecting the rest of the script.

Note on the commit:
Since blueStackRoot.cmd is too large to be edited directly via GitHub's web editor, I had to download it, apply the fix locally on my PC, delete the old file from my fork, and upload the modified version. This is why the commit might appear as a full file replacement rather than a simple 1-line edit, but the only actual code change is the -match to -cmatch modification.