fix(timer): minutes calculation logic (#12857)

plugins/timer/timer.plugin.zsh

@@ -6,7 +6,7 @@ __timer_current_time() {
 }
 
 __timer_format_duration() {
-  local mins=$(printf '%.0f' $(($1 / 60)))
+  local mins=$(printf '%.0f' $(($(IFS='.' read int dec <<< "$1"; echo $int) / 60)))
   local secs=$(printf "%.${TIMER_PRECISION:-1}f" $(($1 - 60 * mins)))
   local duration_str=$(echo "${mins}m${secs}s")
   local format="${TIMER_FORMAT:-/%d}"