Unbreak rendering & wrapping of commands typed at an interactive prompt

... by wrapping the terminal escape sequences in '\[' and '\]':
https://www.gnu.org/software/bash/manual/html_node/Controlling-the-Prompt.html

https://github.com/debarshiray/toolbox/issues/190

profile.d/toolbox.sh

@@ -25,7 +25,7 @@ fi
 
 if [ -f /run/.containerenv ] \
    && [ -f /run/.toolboxenv ]; then
-    PS1=$(printf "\033[35m⬢\033[0m%s" "[\u@\h \W]\\$ ")
+    PS1=$(printf "\[\033[35m\]⬢\[\033[0m\]%s" "[\u@\h \W]\\$ ")
 
     if ! [ -f "$toolbox_welcome_stub" ]; then
         echo ""