Fix the bogus, zero cloud scroll rate in default EE sky settings.

Obvioulsy, there has been a typo done when copying WL default sky parameters to EE ones.
This causes "static" and quite unrealistic clouds when this default setting is used as a
base for a new sky setting, and we see this bad static sky resurfacing now with PBR and
its "adjusted" (more like hacked, but this is another story) mid-day sky setting.

Let's fix this typo once and for all in LL's code base (most TPVs have it fixed already,
and this ever since EEP got released).

@ll: please also fix the cloud scroll rate in the PBR mid-day inventory setting accordingly.

indra/llinventory/llsettingssky.cpp

@@ -729,7 +729,7 @@ LLSD LLSettingsSky::defaults(const LLSettingsBase::TrackPosition& position)
         dfltsetting[SETTING_CLOUD_POS_DENSITY1] = LLColor4(1.0000, 0.5260, 1.0000, 0.0).getValue();
         dfltsetting[SETTING_CLOUD_POS_DENSITY2] = LLColor4(1.0000, 0.5260, 1.0000, 0.0).getValue();
         dfltsetting[SETTING_CLOUD_SCALE]        = LLSD::Real(0.4199);
-        dfltsetting[SETTING_CLOUD_SCROLL_RATE]  = llsd::array(0.0f, 0.0f);
+        dfltsetting[SETTING_CLOUD_SCROLL_RATE]  = llsd::array(0.2, 0.01);
         dfltsetting[SETTING_CLOUD_SHADOW]       = LLSD::Real(0.2699);
         dfltsetting[SETTING_CLOUD_VARIANCE]     = LLSD::Real(0.0);