fix(HtmlFormatter.kt): 限制img正则

src属性前必须有个空格，可能会命中错误
<img src="....." zy-enlarge-src="none">
close #3215

app/src/main/java/io/legado/app/utils/HtmlFormatter.kt

@@ -17,7 +17,7 @@ object HtmlFormatter {
     private val notImgHtmlRegex = "</?(?!img)[a-zA-Z]+(?=[ >])[^<>]*>".toRegex()
     private val otherHtmlRegex = "</?[a-zA-Z]+(?=[ >])[^<>]*>".toRegex()
     private val formatImagePattern = Pattern.compile(
-        "<img[^>]*src *= *\"([^\"{>]*\\{(?:[^{}]|\\{[^}>]+\\})+\\})\"[^>]*>|<img[^>]*data-[^=>]*= *\"([^\">]*)\"[^>]*>|<img[^>]*src *= *\"([^\">]*)\"[^>]*>",
+        "<img[^>]* src *= *\"([^\"{>]*\\{(?:[^{}]|\\{[^}>]+\\})+\\})\"[^>]*>|<img[^>]* data-[^=>]*= *\"([^\">]*)\"[^>]*>|<img[^>]* src *= *\"([^\">]*)\"[^>]*>",
         Pattern.CASE_INSENSITIVE
     )