Make dell service tags case insensitive

Dell service tag is always uppercase, so there is no point in allowing
lowercase input. This supposed reduce amount of errors users can make
when generating password.

src/keygen/dell.spec.ts

@@ -310,6 +310,11 @@ describe("Test Dell BIOS", () => {
     it("Dell for: 1234567-1F66", () => {
         expect(dellSolver("1234567-1f66")).toEqual(["kIpTBzx0m3s10JDR"]);
     });
+    it("Dell for: 123456a-1F66", () => {
+        // AFAIK Dell service tags is always uppercase
+        // so this supposed to calculate password for 123456A-1F66
+        expect(dellSolver("123456a-1f66")).toEqual(["5sS11TUKBmBOQKRS"]);
+    });
     it("Dell HDD for: 1234567890A-595B", () => {
         expect(dellHddSolver("1234567890A-595b")).toEqual(["nyoap4lq"]);
     });
@@ -336,5 +341,6 @@ describe("Latitude 3540", () => {
     });
     it("Dell Latitude 3540 Solver", () => {
         expect(dellLatitude3540Solver("5F3988D5E0ACE4BF-7QH8602")).toEqual(["98072364"]);
+        expect(dellLatitude3540Solver("5F3988D5E0ACE4bF-7QH8602")).toEqual(["98072364"]);
     });
 });

src/keygen/dell/index.ts

@@ -257,8 +257,8 @@ export let dellSolver = makeSolver({
         }
     },
     fun: (password: string) => {
-        let suffix = password.slice(7, 11).toUpperCase();
-        return keygenDell(password.slice(0, 7), suffix as DellTag, SuffixType.ServiceTag);
+        const suffix = password.slice(7, 11).toUpperCase();
+        return keygenDell(password.slice(0, 7).toUpperCase(), suffix as DellTag, SuffixType.ServiceTag);
     }
 });
 
@@ -274,8 +274,8 @@ export let dellHddSolver = makeSolver({
         }
     },
     fun: (password: string) => {
-        let suffix = password.slice(11, 15).toUpperCase();
-        return keygenDell(password.slice(0, 11), suffix as DellTag, SuffixType.HDD);
+        const suffix = password.slice(11, 15).toUpperCase();
+        return keygenDell(password.slice(0, 11).toUpperCase(), suffix as DellTag, SuffixType.HDD);
     }
 });