Invert condition

Rebased to account for upstream normalising slashes to replace forward
slashes with backslashes, simplifying the part that needed to check for
both variants. Perhaps if it'd been like that in the first place, I
wouldn't have made the mistake that made the original version of this
commit necessary.

components/misc/resourcehelpers.cpp

@@ -72,8 +72,8 @@ std::string Misc::ResourceHelpers::correctResourcePath(std::string_view topLevel
         bool needsPrefix = true;
         for (std::string_view alternativeDirectory : alternativeDirectories)
         {
-            if (!correctedPath.starts_with(alternativeDirectory) || correctedPath.size() <= alternativeDirectory.size()
+            if (correctedPath.starts_with(alternativeDirectory) && correctedPath.size() > alternativeDirectory.size()
-                || correctedPath[alternativeDirectory.size()] != '\\')
+                && correctedPath[alternativeDirectory.size()] == '\\')
             {
                 needsPrefix = false;
                 break;