Document fixed bug in smoke test.

Bug #1146 was fixed in #1574. So we can remove the
excemption in the smoke test.

Signed-off-by: Henner Zeller <hzeller@google.com>

.github/bin/smoke-test.sh

diff --git a/.github/bin/smoke-test.sh b/.github/bin/smoke-test.sh
index 4377a01..1e96d74 100755
--- a/.github/bin/smoke-test.sh
+++ b/.github/bin/smoke-test.sh
@@ -105,7 +105,6 @@
 
 #--- ivtest
 KnownIssue[formatter:$BASE_TEST_DIR/ivtest/ivltests/pr2202846c.v]=1015
-KnownIssue[formatter:$BASE_TEST_DIR/ivtest/ivltests/packed_dims_invalid_class.v]=1146
 
 #--- nontrivial-mips
 KnownIssue[formatter:$BASE_TEST_DIR/nontrivial-mips/src/cpu/decode/decoder.sv]=984