Having vue-cli-plugin-tauri installed overrides npmScript, calls wrong command anyways

[lights0123]

If npmScript is explicitly set, it should be respected, and not overridden regardless of what packages are installed. In addition to that problem, its behavior is just wrong. If vue-cli-plugin-tauri is installed, this action will always call the wrong command. If yarn is detected (which is isn't for me because of #161), it just calls yarn, which doesn't actually build anything. If it isn't detected, then it calls npx run tauri:build, which is also wrong because the NPM package run expects a path to a script, not a package.json script. This was probably intended to be npm, not npx.