[nemo-storage] Accept a partition even if it's not mountable or encry…

…pted. Fixes JB#36851

Also following cases should work now (accept as formatable):
- Without partition table & file system
- With partition table but without partition
- With partition table and partition but without file system
- Zero'ed block device

See also commit sha1 bc3d518.

src/udisks2blockdevices.cpp

@@ -284,7 +284,7 @@ void BlockDevices::complete(Block *block, bool forceAccept)
         });
     }
 
-    bool willAccept = !unlocked && (block->isMountable() || block->isEncrypted() || block->isFormatting() || forceAccept);
+    bool willAccept = !unlocked && (block->isPartition() || block->isMountable() || block->isEncrypted() || block->isFormatting() || forceAccept);
     qCInfo(lcMemoryCardLog) << "Completed block" << qPrintable(block->path())
                             << "is" << (willAccept ? "accepted" : "rejected");
     block->dumpInfo();