Change "replace_and_find_by_default" default to true

doc/geany.txt

@@ -2652,7 +2652,7 @@ extract_filetype_regex            Regex to extract filetype name from file     S
 **Search related**
 find_selection_type               See `Find selection`_.                       0           immediately
 **Replace related**
-replace_and_find_by_default       Set ``Replace & Find`` button as default so  false       immediately
+replace_and_find_by_default       Set ``Replace & Find`` button as default so  true        immediately
                                   it will be activated when the Enter key is
                                   pressed while one of the text fields has
                                   focus.

src/keyfile.c

@@ -232,7 +232,7 @@ static void init_pref_groups(void)
 	stash_group_add_string(group, &file_prefs.extract_filetype_regex,
 		"extract_filetype_regex", GEANY_DEFAULT_FILETYPE_REGEX);
 	stash_group_add_boolean(group, &search_prefs.replace_and_find_by_default,
-		"replace_and_find_by_default", FALSE);
+		"replace_and_find_by_default", TRUE);
 
 	/* Note: Interface-related various prefs are in ui_init_prefs() */