Fix: Subtitle deletion matches on substring extension, can delete non-subtitle files (#2584)

Author: Nam0101

app/src/main/java/com/lagradost/cloudstream3/utils/SubtitleUtils.kt

@@ -43,7 +43,7 @@ object SubtitleUtils {
         cleanDisplay: String
     ): Boolean {
         // Check if the file has a valid subtitle extension
-        val hasValidExtension = allowedExtensions.any { name.contains(it, ignoreCase = true) }
+        val hasValidExtension = allowedExtensions.any { name.endsWith(it, ignoreCase = true) }
 
         // We can't have the exact same file as a subtitle
         val isNotDisplayName = !name.equals(display, ignoreCase = true)
@@ -57,4 +57,4 @@ object SubtitleUtils {
     fun cleanDisplayName(name: String): String {
         return name.substringBeforeLast('.').trim()
     }
-}
+}