Increase maximum values in ViewAngle widget

[chapulina]

Summary

Use the absolute maximum number for the widget. I'm dealing with some really large worlds and the current limits aren't enough:

Test it

Load the widget and input crazily large numbers.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #1221 (b4f87e8) into ign-gazebo6 (96ed1ef) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-gazebo6    #1221      +/-   ##
===============================================
- Coverage        61.92%   61.92%   -0.01%     
===============================================
  Files              275      275              
  Lines            22457    22457              
===============================================
- Hits             13907    13906       -1     
- Misses            8550     8551       +1     

Impacted Files	Coverage Δ
src/Server.cc	86.14% <0.00%> (-0.61%)	⬇️

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