AK: Remove infallible version of StringBuilder::to_byte_buffer

Also drop the try_ prefix from the fallible function, as it is no longer
needed to distinguish the two.

Userland/Libraries/LibIMAP/QuotedPrintable.cpp

@@ -80,7 +80,7 @@ ErrorOr<ByteBuffer> decode_quoted_printable(StringView input)
         }
     }
 
-    return output.try_to_byte_buffer();
+    return output.to_byte_buffer();
 }
 
 }