Upgrade python command within matrix daemon

src/freedombone-app-matrix

@@ -448,6 +448,11 @@ function upgrade_matrix {
     fi
     export TMPDIR=/etc/matrix/tmp
 
+    if ! grep -q "$MATRIX_PYTHON" /etc/systemd/system/matrix.service; then
+        sed -i "s|/usr/bin/python|$MATRIX_PYTHON|g" /etc/systemd/system/matrix.service
+        systemctl daemon-reload
+    fi
+
     $MATRIX_PIP install --upgrade --process-dependency-links .
     $MATRIX_PIP install --upgrade --force "pynacl>=1.2.1"