Remove line breaks from valid values for DATM_PRESNDEP

The line break after the last valid value (cplhist) led it to be
interpreted as "cplhist\n", so "cplhist" was determined to be not a
valid value. So apparently we can't have a newline after the last valid
value; I'm not sure about having newlines in other places, but it looked
funny to have newlines in other places and not after the last one, so
I'm just removing all newlines here.

This reverts a change that was made as part of
ESCOMP#373

Author: billsacks

datm/cime_config/config_component.xml

@@ -102,11 +102,7 @@
 
   <entry id="DATM_PRESNDEP">
     <type>char</type>
-    <valid_values>none,
-      clim_1850_cmip7,clim_2000_cmip7,clim_2010_cmip7,hist_cmip7,
-      clim_1850_cmip6,clim_2000_cmip6,clim_2010_cmip6,hist_cmip6,
-      SSP1-2.6,SSP2-4.5,SSP3-7.0,SSP5-3.4,SSP5-8.5,cplhist
-    </valid_values>
+    <valid_values>none,clim_1850_cmip7,clim_2000_cmip7,clim_2010_cmip7,hist_cmip7,clim_1850_cmip6,clim_2000_cmip6,clim_2010_cmip6,hist_cmip6,SSP1-2.6,SSP2-4.5,SSP3-7.0,SSP5-3.4,SSP5-8.5,cplhist</valid_values>
     <default_value>clim_2000</default_value>
     <values match="last">
       <value compset="^1850[CE]?_"  >clim_1850_cmip6</value>