Bug 33429: Use template wrapper for breadcrumbs: Plugins

Bug 33429: Use template wrapper for breadcrumbs: Plugins

This patch updates plugin management templates so that they use the new
WRAPPER for displaying breadcrumbs.

To test, apply the patch and test each page and its variations.
Breadcrumbs should look correct, and each link should be correct.

- In koha-conf.xml, look for "enable_plugins"
  - If this is set to 0, plugins are disabled:
    <enable_plugins>0</enable_plugins>
    - Navigate directly to /cgi-bin/koha/plugins/plugins-home.pl, which
      should say "Plugins disabled." Check the breadcrumbs on this page.
  - Enable plugins by changing the settimg in koha-conf.xml to 1 (a
    restart of services is required): <enable_plugins>1</enable_plugins>
  - Go to Administration -> Manage plugins
    - Test this page and the "Upload plugin" page.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>