git-ls-remote.sh: use the $( ... ) construct for command substitution

The Git CodingGuidelines prefer the $(...) construct for command
substitution instead of using the backquotes `...`.

The backquoted form is the traditional method for command
substitution, and is supported by POSIX.  However, all but the
simplest uses become complicated quickly.  In particular, embedded
command substitutions and/or the use of double quotes require
careful escaping with the backslash character.

The patch was generated by:

for _f in $(find . -name "*.sh")
do
   sed -i 's@`\(.*\)`@$(\1)@g' ${_f}
done

and then carefully proof-read.

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
Reviewed-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/examples/git-ls-remote.sh

@@ -55,11 +55,11 @@ tmpdir=$tmp-d
 case "$peek_repo" in
 http://* | https://* | ftp://* )
 	if [ -n "$GIT_SSL_NO_VERIFY" -o \
-		"`git config --bool http.sslVerify`" = false ]; then
+		"$(git config --bool http.sslVerify)" = false ]; then
 		curl_extra_args="-k"
 	fi
 	if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
-		"`git config --bool http.noEPSV`" = true ]; then
+		"$(git config --bool http.noEPSV)" = true ]; then
 		curl_extra_args="${curl_extra_args} --disable-epsv"
 	fi
 	curl -nsf $curl_extra_args --header "Pragma: no-cache" "$peek_repo/info/refs" ||