configmgr: Let XRegistryKey::getLongValue return boolean values, too

Ever since 21d42ab495 "#75148# check security and
netaccess are set now", getJavaPropsFromSafetySettings in
stoc/source/javavm/javavm.cxx tries to read a Security property (of type
xs:boolean in officecfg/registry/schema/org/openoffice/Office/Java.xcs) via
XRegistryKey::getLongValue.  While this may have worked with the previous
configmgr implementation, it now just always caused an exception (that would
have been swalled in initVMConfiguration in stoc/source/javavm/javavm.cxx).

Not sure if there are any other places where code expects to read a boolean
property value from the configuration via XRegistryKey::getLongValue, but lets
better add that (back) as a (hopefully) harmless extension.

Change-Id: I33ca60595da8fd79fb9250d74f36be0b328d610f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183269
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>

configmgr/source/configurationregistry.cxx

@@ -411,9 +411,13 @@ sal_Int32 RegistryKey::getLongValue()
 {
     std::unique_lock g(service_.mutex_);
     service_.checkValid();
-    sal_Int32 v = 0;
-    if (value_ >>= v) {
-        return v;
+    sal_Int32 v1 = 0;
+    if (value_ >>= v1) {
+        return v1;
+    }
+    bool v2;
+    if (value_ >>= v2) {
+        return sal_Int32(v2);
     }
     throw css::registry::InvalidValueException(
         u"com.sun.star.configuration.ConfigurationRegistry"_ustr,