sdbusplus: remove deprecated --enable-transaction

sdbusplus removed support for disabling transaction IDs and
deprecated the --enable-transaction configure flag.  Remove
it here as well.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic6939d18adc5ae892d6fad9b3286a4cd979b7cdf
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 87017d5..bbd7652 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -372,7 +372,7 @@
 RUN curl -L https://github.com/openbmc/sdbusplus/archive/${PKG_REV['openbmc/sdbusplus']}.tar.gz | tar -xz && \
 cd sdbusplus-* && \
 ./bootstrap.sh && \
-./configure ${CONFIGURE_FLAGS[@]} --disable-tests --enable-transaction && \
+./configure ${CONFIGURE_FLAGS[@]} --disable-tests && \
 make -j$(nproc) && \
 make install