remove extra space from assignment

it was breaking os detection for distros with `/etc/lsb-release`

Author: zb140

run-gow

@@ -254,7 +254,7 @@ function os_type() {
         os="unraid"
     elif [ -f /etc/lsb-release ]; then
         # shellcheck disable=1091
-        os= "$(source /etc/lsb-release; echo "$DISTRIB_ID")"
+        os="$(source /etc/lsb-release; echo "$DISTRIB_ID")"
     elif [ -f /etc/os-release ]; then
         # shellcheck disable=1091
         os="$(source /etc/os-release; echo "$ID")"