Updated CMIP6 ndep file for historical transient Bgc cases, 1850_control same as before

Update the ndep file for transient cases for CLM50 to the CMIP6 version that has identical
data for 1849-1850 to the previous CMIP6 1850_control (with different mid-month times however), and
new 3-member ensemble average/5-year smoothing from the WACCM case: b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.00[123].
The new data is monthly rather than yearly, which means there will be a seasonal cycle to nitrogen deposition
for transient cases now. The midmonth times/dates are different for the multi-year file from
the previous file, so answers change when using it for 1850_control cases even though the data is exactly the same.
Because, of that we are still pointing to the previous 1850 CMIP6 ndep file.

CLM4.5 is still using the previous CMIP5 ndep dataset.