[ fix ] Use the correct fields to update the config (stefan-hoeck#354)

Author: spcfox

src/Pack/Config/Types.idr

@@ -389,9 +389,9 @@ update ci cm = MkConfig {
   , bootstrapStage3 = fromMaybe ci.bootstrapStage3 cm.bootstrapStage3
   , safetyPrompt    = fromMaybe ci.safetyPrompt cm.safetyPrompt
   , gcPrompt        = fromMaybe ci.gcPrompt cm.gcPrompt
-  , gcPurge         = fromMaybe ci.gcPrompt cm.gcPrompt
+  , gcPurge         = fromMaybe ci.gcPurge cm.gcPurge
   , warnDepends     = fromMaybe ci.warnDepends cm.warnDepends
-  , skipTests       = fromMaybe ci.warnDepends cm.warnDepends
+  , skipTests       = fromMaybe ci.skipTests cm.skipTests
   , withSrc         = fromMaybe ci.withSrc cm.withSrc
   , withDocs        = fromMaybe ci.withDocs cm.withDocs
   , useKatla        = fromMaybe ci.useKatla cm.useKatla