Mark SQLITE_IOERR/SQLITE_CANTOPEN as environmental error

Fixes #3060

IOERR: The SQLITE_IOERR result code says that the operation could not finish
because the operating system reported an I/O error.

CANTOPEN: The SQLITE_CANTOPEN result code indicates that SQLite was unable to
open a file. The file in question might be a primary database file or on of
several temporary disk files.

qutebrowser/misc/sql.py

@@ -70,8 +70,10 @@ class SqliteError(SqlError):
         environmental_errors = [
             '5',   # SQLITE_BUSY ("database is locked")
             '8',   # SQLITE_READONLY
+            '10',  # SQLITE_IOERR
             '11',  # SQLITE_CORRUPT
             '13',  # SQLITE_FULL
+            '14',  # SQLITE_CANTOPEN
         ]
         # At least in init(), we can get errors like this:
         # > type: ConnectionError