Revert "Accept [and] and [or] in [filter_wml]"

This reverts commit 82fd82d534.

changelog.md

@@ -18,6 +18,8 @@
    * Fixed images with no alpha channel rendering incorrectly.
    * Fixed unit selection not persisting between uses of Create Unit.
    * Fixed assertion when undoing actions in a synced context.
+   * [filter_wml] no longer accepts [and] and [or] in addition to [not] since
+     the implementation was non-functional.
 
 ## Version 1.13.13
  ### Campaigns

src/config.cpp

@@ -1195,18 +1195,6 @@ bool config::matches(const config& filter) const
 				return false;
 			}
 
-			continue;
-		} else if(i.key == "and") {
-			if(!matches(i.cfg)) {
-				return false;
-			}
-
-			continue;
-		} else if(i.key == "or") {
-			if(matches(i.cfg)) {
-				return true;
-			}
-
 			continue;
 		}