fix configmgr --enable-dconf build

error: no viable conversion from 'const char [1]' to 'std::u16string_view' (aka 'basic_string_view<char16_t>')
and
warning: instead of an 'rtl::OUString' constructed from a 'char16_t', pass a 'std::u16string_view' (or an 'rtl::OUStringChar') [loplugin:stringview]

Change-Id: I0e611606190f063227c5467dc5a082277cebaaa0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/125706
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/configmgr/source/dconf.cxx b/configmgr/source/dconf.cxx
index 1c0711f..9db51fa 100644
--- a/configmgr/source/dconf.cxx
+++ b/configmgr/source/dconf.cxx
@@ -231,11 +231,11 @@ bool decode(OUString * string, bool slash) {
            return true;
        }
        if (string->match("00", i + 1)) {
            *string = string->replaceAt(i, 3, OUString(u'\0'));
            *string = string->replaceAt(i, 3, OUStringChar(u'\0'));
        } else if (slash && string->match("2F", i + 1)) {
            *string = string->replaceAt(i, 3, "/");
            *string = string->replaceAt(i, 3, u"/");
        } else if (string->match("5C", i + 1)) {
            *string = string->replaceAt(i + 1, 2, "");
            *string = string->replaceAt(i + 1, 2, u"");
        } else {
            SAL_WARN("configmgr.dconf", "bad escape in " << *string);
            return false;