Use default CABAL_DIR

Author: jneira

.azure/windows-installhs-cabal.yml

@@ -6,13 +6,13 @@ jobs:
   variables:
     GHC_VERSION: "8.6.5"
     CABAL_VERSION: "3.0.0.0"
-    CABAL_DIR: "D:\\cabal"
+    CABAL_DIR: "" # To use the default one (cabal-hie-install latest fails with a custom one)
     CABAL_STORE_DIR: "D:\\sd"
     PROJECT_FILE: "./install/shake.project"
   steps:
   - task: Cache@2
     inputs:
-      key: '"cabal-installhs-v2" | "$(Agent.OS)" | "$(CABAL_VERSION)" | "$(GHC_VERSION)" | $(Build.SourcesDirectory)/cabal.project | $(Build.SourcesDirectory)/haskell-ide-engine.cabal | $(Build.SourcesDirectory)/hie-plugin-api/hie-plugin-api.cabal'
+      key: '"cabal-installhs" | "$(Agent.OS)" | "$(CABAL_VERSION)" | "$(GHC_VERSION)" | $(Build.SourcesDirectory)/cabal.project | $(Build.SourcesDirectory)/haskell-ide-engine.cabal | $(Build.SourcesDirectory)/hie-plugin-api/hie-plugin-api.cabal'
       path: .azure-cache
       cacheHitVar: CACHE_RESTORED
     displayName: "Download cache"