user: fix ST1005: error strings should not be capitalized (staticcheck)

    Error: user/user.go:447:16: ST1005: error strings should not be capitalized (staticcheck)
                return nil, fmt.Errorf("Unable to find additional groups %v: %w", additionalGroups, err)
                            ^
    Error: user/user.go:471:17: ST1005: error strings should not be capitalized (staticcheck)
                    return nil, fmt.Errorf("Unable to find group %s: %w", ag, ErrNoGroupEntries)
                                ^

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

user/user.go

@@ -444,7 +444,7 @@ func GetAdditionalGroups(additionalGroups []string, group io.Reader) ([]int, err
 			return false
 		})
 		if err != nil {
-			return nil, fmt.Errorf("Unable to find additional groups %v: %w", additionalGroups, err)
+			return nil, fmt.Errorf("unable to find additional groups %v: %w", additionalGroups, err)
 		}
 	}
 
@@ -468,7 +468,7 @@ func GetAdditionalGroups(additionalGroups []string, group io.Reader) ([]int, err
 			gid, err := strconv.ParseInt(ag, 10, 64)
 			if err != nil {
 				// Not a numeric ID either.
-				return nil, fmt.Errorf("Unable to find group %s: %w", ag, ErrNoGroupEntries)
+				return nil, fmt.Errorf("unable to find group %s: %w", ag, ErrNoGroupEntries)
 			}
 			// Ensure gid is inside gid range.
 			if gid < minID || gid > maxID {