Correct handling of using installer as command var

Scripts/install-requirements.bash

@@ -24,7 +24,7 @@ install_method_centos() {
     fi
     echo "Installing epel-release, NOT fully configured..., see: https://docs.fedoraproject.org/en-US/epel/"
     sleep 3
-    "$("${INSTALLER}" epel-release)"
+    "${INSTALLER}" epel-release
 }
 
 install_method_ubuntu() {
@@ -70,7 +70,7 @@ main() {
 
     for pkg in "${INSTALL_PACKAGES[@]}"; do
         echo "Installing ${pkg}"
-        "$("${INSTALLER}" "${pkg}")"
+        "${INSTALLER}" "${pkg}"
     done
 
     echo "Finished installing general module items"