CI: massage the .clang-format file, it's just ASCII

.clang-format

@@ -1,34 +1,32 @@
----
+---
 BasedOnStyle: WebKit
 
 AlignAfterOpenBracket: Align
 AlignEscapedNewlines: Left
-AllowAllParametersOfDeclarationOnNextLine: 'false'
+AllowAllParametersOfDeclarationOnNextLine: "false"
 AllowShortFunctionsOnASingleLine: Inline
-AllowShortIfStatementsOnASingleLine: 'false'
+AllowShortIfStatementsOnASingleLine: "false"
-AllowShortLoopsOnASingleLine: 'false'
+AllowShortLoopsOnASingleLine: "false"
 AlwaysBreakAfterReturnType: TopLevelDefinitions
 AlwaysBreakTemplateDeclarations: Yes
-BinPackArguments: 'false'
+BinPackArguments: "false"
-BinPackParameters: 'false'
+BinPackParameters: "false"
 BreakBeforeBraces: Allman
-BreakBeforeTernaryOperators: 'true'
+BreakBeforeTernaryOperators: "true"
 BreakConstructorInitializers: BeforeComma
 ColumnLimit: 120
-Cpp11BracedListStyle: 'false'
+Cpp11BracedListStyle: "false"
-FixNamespaceComments: 'true'
+FixNamespaceComments: "true"
 IncludeBlocks: Preserve
-IndentWidth: '4'
+IndentWidth: "4"
-MaxEmptyLinesToKeep: '2'
+MaxEmptyLinesToKeep: "2"
 NamespaceIndentation: None
 PointerAlignment: Left
-ReflowComments: 'false'
+ReflowComments: "false"
-SortIncludes: 'true'
+SortIncludes: "true"
-SpaceAfterCStyleCast: 'false'
+SpaceAfterCStyleCast: "false"
-SpacesBeforeTrailingComments: '2'
+SpacesBeforeTrailingComments: "2"
-SpacesInAngles: 'true'
+SpacesInAngles: "true"
-SpacesInParentheses: 'true'
+SpacesInParentheses: "true"
-SpacesInSquareBrackets: 'true'
+SpacesInSquareBrackets: "true"
 Standard: Cpp11
-
-...