Bug 8766 - OPACBaseURL still called as OPACBaseurl in many files

Bug 8766 - OPACBaseURL still called as OPACBaseurl in many files

This patch fixes incorrect capitalization of the OPACBaseURL
variable in three templates. The fix can be confirmed in
opac-results.tt by inspecting the link attached to the RSS
icon on the OPAC's search results screen. The same fix is included
in opac-opensearch.tt and search/results.tt but I'm not sure
how you confirm that this change fixes anything, if it does.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>