cfg_workspace: Accept outputs with spaces again

This is a regression from bce088679.

An other way to fix this would be to concatenate strings inside the
strtok loop when an output starts with a double quote but I'd rather
let the parser do the word splitting.

Fixes #3646

parser-specs/config.spec

@@ -277,11 +277,13 @@ state WORKSPACE:
 
 state WORKSPACE_OUTPUT:
   'output'
-      -> WORKSPACE_OUTPUT_STR
+      -> WORKSPACE_OUTPUT_WORD
 
-state WORKSPACE_OUTPUT_STR:
-  output = string
-      -> call cfg_workspace($workspace, $output)
+state WORKSPACE_OUTPUT_WORD:
+  output = word
+      -> call cfg_workspace($workspace, $output); WORKSPACE_OUTPUT_WORD
+  end
+      -> INITIAL
 
 # ipc-socket <path>
 state IPC_SOCKET: