fix(bash): fix loss of the last output line with enter_accept (#1463)

With a single-line prompt, the last line of the output of the previous
command is overwritten by the prompt on the enter_accept.  In this
situation, `tput cuu` receives 0 as the argument, but `tput cuu 0`
emits the control sequence `\e[0A`, which moves the cursor above by
one line unexpectedly.  This is because the parameter 0 for CUU means
the default value, 1.  In this patch, to avoid moving the cursor when
the prompt offset is 0, we check the offset value before running `tput
cuu`.

atuin/src/shell/atuin.bash

@@ -29,8 +29,11 @@ __atuin_history() {
     then
       HISTORY=${HISTORY#__atuin_accept__:}
       # Reprint the prompt, accounting for multiple lines
-      # shellcheck disable=SC2046
-      tput cuu $(echo -n "${PS1@P}" | tr -cd '\n' | wc -c)
+      local __atuin_prompt_offset
+      __atuin_prompt_offset=$(echo -n "${PS1@P}" | tr -cd '\n' | wc -c)
+      if ((__atuin_prompt_offset > 0)); then
+        tput cuu "$__atuin_prompt_offset"
+      fi
       echo "${PS1@P}$HISTORY"
 
       if [[ -n "${BLE_VERSION-}" ]]; then