[Bug]: No offers for most backends if lower disk bound not set

[jvstme]

Steps to reproduce

> cat .dstack.yml
type: dev-environment
ide: vscode

resources:
  disk: ..500GB

> dstack apply -b aws

Actual behaviour

 Configuration          .dstack.yml                    
 Project                main                         
 User                   admin                         
 Pool                   default-pool                   
 Min resources          2..xCPU, 8GB.., ..500GB (disk) 
 Max price              -                              
 Max duration           6h                             
 Spot policy            on-demand                      
 Retry policy           no                             
 Creation policy        reuse-or-create                
 Termination policy     destroy-after-idle             
 Termination idle time  5m                             

Submit a new run? [y/n]:

Expected behaviour

 Configuration          .dstack.yml                    
 Project                main                         
 User                   admin                         
 Pool                   default-pool                   
 Min resources          2..xCPU, 8GB.., ..500GB (disk) 
 Max price              -                              
 Max duration           6h                             
 Spot policy            on-demand                      
 Retry policy           no                             
 Creation policy        reuse-or-create                
 Termination policy     destroy-after-idle             
 Termination idle time  5m                             

 #  BACKEND  REGION     INSTANCE  RESOURCES                   SPOT  PRICE    
 1  aws      us-east-1  m5.large  2xCPU, 8GB, 100.0GB (disk)  no    $0.096   
 2  aws      us-east-2  m5.large  2xCPU, 8GB, 100.0GB (disk)  no    $0.096   
 3  aws      us-west-2  m5.large  2xCPU, 8GB, 100.0GB (disk)  no    $0.096   
    ...                                                                      
 Shown 3 of 397 offers, $113.068 max

Submit a new run? [y/n]:

dstack version

0.18.8

Server logs

No response

Additional information

No response