Add support for Unity 2019 Linux-Mono-Support-for-Editor installer template

Author: ivan-trackman

UnitySetup/UnitySetup.psm1

@@ -359,7 +359,8 @@ function Find-UnitySetupInstaller {
         [UnitySetupComponent]::iOS            = , "$targetSupport/UnitySetup-iOS-Support-for-Editor-$Version.$installerExtension";
         [UnitySetupComponent]::AppleTV        = , "$targetSupport/UnitySetup-AppleTV-Support-for-Editor-$Version.$installerExtension";
         [UnitySetupComponent]::Facebook       = , "$targetSupport/UnitySetup-Facebook-Games-Support-for-Editor-$Version.$installerExtension";
-        [UnitySetupComponent]::Linux          = , "$targetSupport/UnitySetup-Linux-Support-for-Editor-$Version.$installerExtension";
+        [UnitySetupComponent]::Linux          =   "$targetSupport/UnitySetup-Linux-Support-for-Editor-$Version.$installerExtension",
+                                                  "$targetSupport/UnitySetup-Linux-Mono-Support-for-Editor-$Version.$installerExtension";
         [UnitySetupComponent]::Mac            =   "$targetSupport/UnitySetup-Mac-Support-for-Editor-$Version.$installerExtension",
                                                   "$targetSupport/UnitySetup-Mac-Mono-Support-for-Editor-$Version.$installerExtension";
         [UnitySetupComponent]::Mac_IL2CPP     = , "$targetSupport/UnitySetup-Mac-IL2CPP-Support-for-Editor-$Version.$installerExtension";