keep the user shell prompt string if it exists. Make shfmt happy

require-ess/tools/setE3Env.bash

@@ -357,14 +357,14 @@ BASE_version=$(echo "${EPICS_BASE##*/}" | awk -F '-' '{print $2}')
 E3_ENV_INFO="{B:$BASE_version R:$E3_REQUIRE_VERSION}"
 NEW_E3_PS="${E3_ENV_INFO}\[\033[33m\]\u\[\033[m\]@\[\033[33;1m\]\w\[\033[m\]\$ "
 
-if [ -z "$E3_ENV_ON" ]; then   
+if [ -z "$E3_ENV_ON" ]; then
   if [ -z "$PS1" ]; then
     export E3_ENV_ON="ON"
     export PS1="${NEW_E3_PS}"
   else
-    export E3_ENV_ON="ON" 
+    export E3_ENV_ON="ON"
     export PS1="${E3_ENV_INFO}${PS1}"
-  fi                                  
+  fi
 else
   PS_TMP=${PS1/\{*\}/}
   export PS1="${E3_ENV_INFO}${PS_TMP}"