[Ada] Fix style in expansion of attribute Put_Image

[Pierre-Marie de Rodat]

Style cleanup only.

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

gcc/ada/

	* exp_put_image.adb (Make_Put_Image_Name): Fix style.
	(Image_Should_Call_Put_Image): Likewise.
	(Build_Image_Call): Likewise.
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