Fix function definition order

Function was used before its definition

.devcontainer/image/texlive.sh

@@ -9,6 +9,9 @@ usage() {
  echo "Usage: $0 get_installer|install latest|version (YYYY)"
 }
 
+# From: https://stackoverflow.com/a/2990533/11477374
+echoerr() { echo "$@" 1>&2; }
+
 check_path() {
  # The following test assumes the most basic program, `tex`, is present, see also
  # https://www.tug.org/texlive/doc/texlive-en/texlive-en.html#x1-380003.5
@@ -29,9 +32,6 @@ if [[ $# != 2 ]]; then
  exit 64
 fi
 
-# From: https://stackoverflow.com/a/2990533/11477374
-echoerr() { echo "$@" 1>&2; }
-
 # Bind CLI arguments to explicit names:
 ACTION=${1}
 VERSION=${2}