Resolves: tdf#124454 exec the matrix operator on values converted from strings

Effectively a fallout from the matrix operations rework started
for tdf#89387 that did not convert strings at all and subsequent
work converted the string according to settings but did not apply
the current operator on the result.

Change-Id: I90c8963021396fd9a46b063f6aee96283f89271a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/98385
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins
(cherry picked from commit 7ead920f7015bb8e7a4343b863333bb26187d9a3)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/98338
diff --git a/sc/source/core/tool/scmatrix.cxx b/sc/source/core/tool/scmatrix.cxx
index b27f73a..fdba2f1 100644
--- a/sc/source/core/tool/scmatrix.cxx
+++ b/sc/source/core/tool/scmatrix.cxx
@@ -3367,7 +3367,7 @@ public:

    double operator()(const svl::SharedString& rStr) const
    {
        return convertStringToValue( mpErrorInterpreter, rStr.getString());
        return maOp( convertStringToValue( mpErrorInterpreter, rStr.getString()), mfVal);
    }

    TEmptyRes operator()(char) const