Fix flaky transform test

[nahueespinosa]

Proposed changes

The test added in #212 turned out to be flaky.

The failure rate is ~20% and can be evaluated with this command:

$ ./build/beluga_amcl/test/test_amcl_node --gtest_repeat=1000 --gtest_filter=TestNode.TransformValue 2> /dev/null | grep "1 FAILED" | wc -l
189

The error looks like this:

/ws/src/beluga/beluga_amcl/test/test_amcl_node.cpp:877: Failure
The difference between transform.translation().x() and -2.00 is 0.010270443192699208, which exceeds 0.01, where
transform.translation().x() evaluates to -2.0102704431926992,
-2.00 evaluates to -2, and
0.01 evaluates to 0.01.
/ws/src/beluga/beluga_amcl/test/test_amcl_node.cpp:878: Failure
The difference between transform.translation().y() and -2.00 is 0.01017702160925138, which exceeds 0.01, where
transform.translation().y() evaluates to -1.9898229783907486,
-2.00 evaluates to -2, and
0.01 evaluates to 0.01.

After this change, we get 0% failure rate:

$ ./build/beluga_amcl/test/test_amcl_node --gtest_repeat=1000 --gtest_filter=TestNode.TransformValue 2> /dev/null | grep "1 FAILED" | wc -l
0

Type of change

• 🐛 Bugfix (change which fixes an issue)
• 🚀 Feature (change which adds functionality)
• 📚 Documentation (change which fixes or extends documentation)

Checklist

• Lint and unit tests (if any) pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• All commits have been signed for DCO

[glpuga]

LGTM