[Ada] Fix incorrect Do_Range_Check on type conversion

[Pierre-Marie de Rodat]

This gets rid of another leak of the Do_Range_Check flag to the back-end
which is specific to expression functions.  No functional changes.

Tested on x86_64-pc-linux-gnu, committed on trunk

2019-08-12  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* checks.adb (Activate_Range_Check): Remove redundant argument.
	(Generate_Range_Check): Likewise.
	(Apply_Float_Conversion_Check): Reset the Do_Range_Check flag on
	entry and remove redundant condition.
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