GuiText: Fix color preset.

[V10lator]

It's broken and instead of searching a fix we can just remove the useless transitions between GX2ColorF32 and glm::vec4.

[V10lator]

You're probably right on this but then again: Why convert from glm::vec4 to GX2ColorF32 in the first place? All instances where it gets read out convert it back to glm::vec4, that's what I meanded with "useless transitions".
I also think as a GUI library the codes should be as fast as possible* so converting back and forth shouldn't be done (esp if it's for no reason).

*I'm even compiling libgui with way more agressive FLAGS:

	@sed -i 's/-save-temps/-pipe/g' libgui/Makefile
	@sed -i '/			-ffunction-sections -fdata-sections \\/d' libgui/Makefile
	@sed -i 's/$$(ARCH) -/$$(ARCH) $$(CFLAGS) -/g' libgui/Makefile
	@sed -i 's/-DNDEBUG=1 -O2 -s/$(LIBGUIFLAGS)/g' libgui/Makefile
	@cd libgui && for patch in $(TOPDIR)/libgui-patches/*.patch; do echo Applying $$patch && git apply $$patch; done && $(MAKE)

release:	LIBGUIFLAGS	:=	-Ofast -flto=auto -fno-fat-lto-objects \
							-fuse-linker-plugin -s -DNDEBUG=1

Didn't make a pull request for that yet as it's highly experimental and I want to make sure it doesn't break anything before. [EDIT]Also LTO might not be feasible upstream as all projects using the library would need to be compiled with LTO, too.[/EDIT]