ka.tests: Fixes a floating conversion in functional tests.
ka.tests: Fixes a floating conversion in functional tests.

VS2015 didn't accept constructing a `std::vector<float>` from double literal
values (e.g. `std::vector<float>{2.5, 3.8}` caused a compilation error).
Consequently, `float` is replaced by `double` as this does not impact test
semantics.

Change-Id: I9b63693e45381e7005551aa2c01e73f2fc663f55
Reviewed-on: http://gerrit2.aldebaran.lan/1205
Tested-by: jmonnon <8898eaf233516e520f996a244ca8a12d20f948b1@aldebaran.com>
Reviewed-by: philippe.martin <a3db8b74c3cf86a5cf091dca4e2125b498be933d@softbankrobotics.com>
Reviewed-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi