[lldb] Findtypes -gmodules fix for too many matches

Apparently the intention was to copy the condition above:
  if (types.GetSize() >= max_matches)
    break;

So that if the iteration stopped because of too many matches we do not
add even more matches in this 'Clang modules' block downward.

It was implemented by:
  SymbolFileDWARF: Unconditionally scan through clang modules. NFCish
  fe9eaad

Differential Revision: https://reviews.llvm.org/D77336

Author: jankratochvil

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

@@ -2407,7 +2407,7 @@ void SymbolFileDWARF::FindTypes(
   // Next search through the reachable Clang modules. This only applies for
   // DWARF objects compiled with -gmodules that haven't been processed by
   // dsymutil.
-  if (num_die_matches < max_matches) {
+  if (types.GetSize() < max_matches) {
     UpdateExternalModuleListIfNeeded();
 
     for (const auto &pair : m_external_type_modules)