clang-tidy: Disable performance-no-automatic-move

It's just too aggressive with Qt classes that are refcounted and fine to
copy

.clang-tidy

@@ -1,5 +1,5 @@
 ---
-Checks:          'clang-diagnostic-*,clang-analyzer-*,-*,performance-*,bugprone-*,readability-inconsistent-declaration-parameter-name,readability-string-compare,modernize-redundant-void-arg,modernize-use-bool-literals,modernize-make-unique,modernize-make-shared,modernize-use-override,modernize-use-equals-delete,modernize-use-emplace,modernize-loop-convert,modernize-use-nullptr,-bugprone-macro-parentheses,-bugprone-narrowing-conversions,-bugprone-branch-clone,-bugprone-incorrect-roundings,-bugprone-suspicious-include,-bugprone-reserved-identifier'
+Checks:          'clang-diagnostic-*,clang-analyzer-*,-*,performance-*,bugprone-*,readability-inconsistent-declaration-parameter-name,readability-string-compare,modernize-redundant-void-arg,modernize-use-bool-literals,modernize-make-unique,modernize-make-shared,modernize-use-override,modernize-use-equals-delete,modernize-use-emplace,modernize-loop-convert,modernize-use-nullptr,-bugprone-macro-parentheses,-bugprone-narrowing-conversions,-bugprone-branch-clone,-bugprone-incorrect-roundings,-bugprone-suspicious-include,-bugprone-reserved-identifier,-performance-no-automatic-move'
 WarningsAsErrors: '*'
 HeaderFilterRegex: '.*/okular/.*'
 AnalyzeTemporaryDtors: false

generators/dvi/dviFile.cpp

@@ -420,7 +420,7 @@ QString dvifile::convertPDFtoPS(const QString &PDFFilename, QString *converrorms
     convertedFiles[PDFFilename] = convertedFileName;
 
     tmpfile.setAutoRemove(false);
-    return convertedFileName; //// NOLINT(performance-no-automatic-move) QString is cheap to copy and we prefer the const safety
+    return convertedFileName;
 }
 
 bool dvifile::saveAs(const QString &filename)