cue files: #compute -> #up

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/compute/invalid/bool/main.cue

@@ -1,3 +1,3 @@
 package testing
 
-#compute: true
+#up: true

tests/compute/invalid/int/main.cue

@@ -1,3 +1,3 @@
 package testing
 
-#compute: 123
+#up: 123

tests/compute/invalid/string/main.cue

@@ -1,3 +1,3 @@
 package testing
 
-#compute: "whatever"
+#up: "whatever"

tests/compute/invalid/struct/main.cue

@@ -1,3 +1,3 @@
 package testing
 
-#compute: whatever: "wrong"
+#up: whatever: "wrong"