refactor: privatization of a constant

Author: hejsztynx

ios/utils/ItalicUtils.h

@@ -11,9 +11,6 @@ typedef NS_ENUM(NSInteger, ItalicKind) {
   ItalicKindOblique,
 };
 
-// slant used when a font has no italic face
-extern const CGFloat kObliquenessFallback;
-
 @interface ItalicUtils : NSObject
 
 + (void)applyItalicForFont:(UIFont *)font

ios/utils/ItalicUtils.mm

@@ -1,7 +1,8 @@
 #import "ItalicUtils.h"
 #import "FontExtension.h"
 
-const CGFloat kObliquenessFallback = 0.2;
+// slant used when a font has no italic face
+static const CGFloat kObliquenessFallback = 0.2;
 
 @interface ItalicUtils ()