resolved Switching to gun as CPG doesn't reset to MAN RNG

[FalcoGer]

When selecting the gun as CPG it doesn't reset to MAN RNG, even when in CHMD as sight.

Steps to reproduce:

1. Enter CPG seat
2. Select desired MAN RNG (optional)
3. Select TADS as sight
4. Laser range something
5. Select HMD as sight
6. Select Gun

Expected: Man range set as range source with the selected value

Actual: No change, last laser range still valid

Track attached

cpg_no_manrng_rst.trk

[BIGNEWY]

This is reported 

thank you