Fixed the arch package check problem if the package is already installed

[ViniciusRed]

By not specifying the package name to pacman the function was not working correctly

After the change

[damentz]

Ya, this completely breaks the script by removing necessary backslashes and adding a redundant addition to the pacman commands.

Not to mention, you managed to change half the file with random white spaces changes, which I'll never accept.

Closing.

[ViniciusRed]

backslashes and spaces were removed when formatting using vscode, but ok, one try and one more learning experience