Fix crash with quoted filter patterns

Remove the quotes from the text not the regex.
Closes #181

Clover/app/src/main/java/org/floens/chan/core/manager/FilterEngine.java

@@ -226,7 +226,8 @@ public class FilterEngine {
             }
         } else if (rawPattern.length() >= 2 && rawPattern.charAt(0) == '"' && rawPattern.charAt(rawPattern.length() - 1) == '"') {
             // "matches an exact sentence"
-            pattern = Pattern.compile(escapeRegex(rawPattern).substring(1, rawPattern.length() - 1));
+            String text = escapeRegex(rawPattern.substring(1, rawPattern.length() - 1));
+            pattern = Pattern.compile(text);
         } else {
             String[] words = rawPattern.split(" ");
             String text = "";