Fixing battery prompt formatting issue (cf #5894) (#5895)

Signed-off-by: Guyzmo <guyzmo+github+pub@m0g.net>

plugins/battery/battery.plugin.zsh

@@ -100,7 +100,7 @@ elif [[ "$OSTYPE" = linux*  ]] ; then
       else
         color='red'
       fi
-      echo "%{$fg[$color]%}[$(battery_pct_remaining)%%]%{$reset_color%}"
+      echo "%{$fg[$color]%}$(battery_pct_remaining)%%%{$reset_color%}"
     else
       echo "∞"
     fi