Two bugs in handleMsgMhfEnumerateQuest affecting reward multipliers:
1. A Value > 0 filter silently dropped any multiplier set to exactly
0.0 in config, causing the client to fall back to its hardcoded
default (100%). So ZennyMultiplier: 0.0 produced *full* zenny
instead of none. Removed the filter so zero values are sent
verbatim.
2. uint16(float32(0.20) * 100) yields 19, not 20, due to float32
representation of 0.20 being ~0.19999998. Added a
multiplierToTuneValue helper using math.Round and applied it to
all 18 multiplier call sites (HRP/SRP/GRP/GSRP/Zenny/GZenny/
Material/GMaterial/GCP/GUrgent and NC variants).
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