Remove duplicative phase code.

actions.c

@@ -1575,7 +1575,7 @@ int action(command_t command)
     case unknown:
         /* Unknown verb, couldn't deduce object - might need hint */
         sspeak(WHAT_DO, command.word[0].raw);
-        return GO_CHECKHINT;
+        return GO_CLEAROBJ;
     default: // LCOV_EXCL_LINE
         BUG(SPEECHPART_NOT_TRANSITIVE_OR_INTRANSITIVE_OR_UNKNOWN); // LCOV_EXCL_LINE
     }

advent.h

@@ -100,7 +100,6 @@ enum phase_codes {
     GO_MOVE,
     GO_TOP,
     GO_CLEAROBJ,
-    GO_CHECKHINT,
     GO_WORD2,
     GO_UNKNOWN,
     GO_DWARFWAKE,

main.c

@@ -1199,7 +1199,6 @@ Lookup:
             sspeak(DO_WHAT, command.word[0].raw);
             command.obj = 0;
         // Fallthrough
-        case GO_CHECKHINT: // Fallthrough
         case GO_CLEAROBJ:
             goto Lclearobj;
         case GO_DWARFWAKE: