Trailing zeroes in float cvar breaks text comparison in RmlUi

[illwieckz]

As you can see flot cvars like the cg_motionblur one can be converted to text with trailing zeroes, meaning it doesn't match the default value and the drop down menu doesn't indicate the currently used option:

[necessarily-equal]

0.05 is special as it doesn't have an exact value in float. But the issue is different here, it's just extra 0 even in the 0.0 case