Update Japscan.kt (#15979)

Fix Referer
Closes #15749

src/fr/japscan/build.gradle

@@ -6,7 +6,7 @@ ext {
     extName = 'Japscan'
     pkgNameSuffix = 'fr.japscan'
     extClass = '.Japscan'
-    extVersionCode = 39
+    extVersionCode = 40
 }
 
 apply from: "$rootDir/common.gradle"

src/fr/japscan/src/eu/kanade/tachiyomi/extension/fr/japscan/Japscan.kt

@@ -68,6 +68,9 @@ class Japscan : ConfigurableSource, ParsedHttpSource() {
     }
 
     private fun chapterListPref() = preferences.getString(SHOW_SPOILER_CHAPTERS, "hide")
+    
+    override fun headersBuilder() = super.headersBuilder()
+        .add("referer", "$baseUrl/")
 
     // Popular
     override fun popularMangaRequest(page: Int): Request {