GS: Fix up overscan offsets. Stop using 3:2 for overscan. #8996
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Description of Changes
Fixes up the offsets for overscan modes and correctly stays in 4:3 when overscanning, closer matching the PS2
Rationale behind Changes
Numbers were quite a bit off, causing a weird vertical offset. and I don't know where I hit my head to think I needed to change aspect. Closer matches PS2 output now.
Suggested Testing Steps
None really, just PRing for the CI then merge, already gone through it on Discord with Nicknine.
Before:
After:
PS2 output through capture (with exagerated gamma/greenness so you can see the borders):