Update themes/agnoster.zsh-theme

Use basename when setting prompt segment text for the conda environment to avoid overly long promps when using an environment created outside the default location.

Co-Authored-By: Avraham Shukron <avraham.shukron@gmail.com>

themes/agnoster.zsh-theme

@@ -205,7 +205,7 @@ prompt_conda() {
   local conda_env="$CONDA_DEFAULT_ENV"
   if [[ -n $conda_env ]]; then
     if [[ -z $CONDA_PROMPT_MODIFIER ]]; then
-      prompt_segment blue black "conda:$conda_env"
+      prompt_segment blue black "conda:$(basename $conda_env)"
     fi
   fi
 }