phetsims/vector-addition

change origin manipulator color

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@arouinfar said (paraphrasing) in 10/10/19 design meeting:

Students in interviews went for the origin manipulator first. We need to change the color to make it less inviting.

Changed to rgb( 150, 150, 150 ) in design meeting, approved by @arouinfar @ariel-phet @kathy-phet.

Closing.