Remove duplicate XML tag in pendulum_links example world

[iche033]

Signed-off-by: Ian Chen [email protected]

🦟 Bug fix

Summary

removes duplicate <?xml version="1.0" ?> line otherwise sdformat gives an error about parsing the SDF file

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #1002 (b201684) into ign-gazebo3 (d9195c4) will increase coverage by 0.27%.
The diff coverage is 78.03%.

❗ Current head b201684 differs from pull request most recent head fec2c7c. Consider uploading reports for the commit fec2c7c to get more accurate results

@@               Coverage Diff               @@
##           ign-gazebo3    #1002      +/-   ##
===============================================
+ Coverage        77.56%   77.84%   +0.27%     
===============================================
  Files              208      221      +13     
  Lines            11385    12687    +1302     
===============================================
+ Hits              8831     9876    +1045     
- Misses            2554     2811     +257     

Impacted Files	Coverage Δ
include/ignition/gazebo/EntityComponentManager.hh	100.00% <ø> (ø)
include/ignition/gazebo/Link.hh	100.00% <ø> (ø)
include/ignition/gazebo/Server.hh	100.00% <ø> (ø)
...nclude/ignition/gazebo/components/ContactSensor.hh	100.00% <ø> (ø)
include/ignition/gazebo/components/Factory.hh	96.05% <ø> (ø)
...nclude/ignition/gazebo/components/LogicalCamera.hh	100.00% <ø> (ø)
include/ignition/gazebo/components/Sensor.hh	100.00% <ø> (ø)
...nclude/ignition/gazebo/components/Serialization.hh	90.32% <ø> (ø)
include/ignition/gazebo/gui/GuiSystem.hh	0.00% <0.00%> (ø)
.../plugins/component_inspector/ComponentInspector.cc	8.58% <0.00%> (-0.90%)	⬇️
... and 123 more

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