hydra.el (hydra-key-format-spec): set default to "%s"

* hydra-test.el (hydra-format): Update test.
(hydra-format-with-sexp): Update test.

hydra-test.el

@@ -685,9 +685,9 @@ _f_ auto-fill-mode:    %`auto-fill-function
     ("t" toggle-truncate-lines nil)
     ("w" whitespace-mode nil)
     ("q" nil "quit"))))
-           '(concat (format "% 3s abbrev-mode:       %S
-% 3s debug-on-error:    %S
-% 3s auto-fill-mode:    %S
+           '(concat (format "%s abbrev-mode:       %S
+%s debug-on-error:    %S
+%s auto-fill-mode:    %S
 " "{a}" abbrev-mode "{d}" debug-on-error "{f}" auto-fill-function) "[[q]]: quit"))))
 
 (ert-deftest hydra-format-with-sexp ()
@@ -698,7 +698,7 @@ _f_ auto-fill-mode:    %`auto-fill-function
               'hydra-toggle nil
               "\n_n_ narrow-or-widen-dwim %(progn (message \"checking\")(buffer-narrowed-p))asdf\n"
               '(("n" narrow-to-region nil) ("q" nil "cancel"))))
-           '(concat (format "% 3s narrow-or-widen-dwim %Sasdf\n"
+           '(concat (format "%s narrow-or-widen-dwim %Sasdf\n"
                      "{n}"
                      (progn
                        (message "checking")

hydra.el

@@ -121,7 +121,7 @@ It's possible to set this to nil.")
   "When non-nil, hydra will issue some non-essential style warnings."
   :type 'boolean)
 
-(defcustom hydra-key-format-spec "% 3s"
+(defcustom hydra-key-format-spec "%s"
   "Default `format'-style specifier for _a_  syntax in docstrings.
 When nil, you can specify your own at each location like this: _ 5a_.")