Don't automatically assign SOLID to brushes that have a valid trace type

Fix mixed contents warning displaying the wrong contents

common/bspfile.cc

@@ -628,7 +628,7 @@ struct gamedef_q2_t : public gamedef_t
         contentflags_t surf_contents = contents;
 
         // if we don't have a declared content type, assume solid.
-        if (!(surf_contents.native & ((Q2_LAST_VISIBLE_CONTENTS << 1) - 1))) {
+        if (!get_content_type(surf_contents)) {
             surf_contents.native |= Q2_CONTENTS_SOLID;
         }
 

qbsp/brush.cc

@@ -682,7 +682,7 @@ static contentflags_t Brush_GetContents(const mapbrush_t *mapbrush)
 
         if (!contents.types_equal(base_contents, options.target_game)) {
             LogPrint("mixed face contents ({} != {}) at line {}\n",
-                contentflags_t{mapface.contents}.to_string(options.target_game),
+                base_contents.to_string(options.target_game),
                 contents.to_string(options.target_game), mapface.linenum);
             break;
         }