Disable minus or plus buttons in Counter when we reach min or max value

Fixes: https://github.com/lesspass/lesspass/issues/362

packages/mobile/src/password/Counter.js

@@ -28,7 +28,14 @@ export default class Counter extends Component {
   };
 
   render() {
-    const { label, value, onValueChange, ...props } = this.props;
+    const {
+      label,
+      value,
+      onValueChange,
+      minValue,
+      maxValue,
+      ...props
+    } = this.props;
     const { isValid } = this.state;
     const isValidBackgroundColor = isValid
       ? Theme.colors.primary
@@ -65,8 +72,10 @@ export default class Counter extends Component {
             }}
             onPress={() => {
               const newValue = value - 1;
-              this.checkOptionsAreValid(newValue);
-              this.setNewValue(newValue);
+              if (!minValue || newValue >= minValue) {
+                this.checkOptionsAreValid(newValue);
+                this.setNewValue(newValue);
+              }
             }}
           >
             <Icon
@@ -121,8 +130,10 @@ export default class Counter extends Component {
             }}
             onPress={() => {
               const newValue = value + 1;
-              this.checkOptionsAreValid(newValue);
-              this.setNewValue(newValue);
+              if (!maxValue || newValue <= maxValue) {
+                this.checkOptionsAreValid(newValue);
+                this.setNewValue(newValue);
+              }
             }}
           >
             <Icon

packages/mobile/src/password/PasswordGeneratorScreen.js

@@ -193,6 +193,8 @@ export class PasswordGeneratorScreen extends Component {
                   label="Length"
                   value={length}
                   isValueValid={isLengthValid}
+                  minValue={5}
+                  maxValue={35}
                   onValueChange={value => {
                     this.setState({
                       length: value
@@ -203,6 +205,7 @@ export class PasswordGeneratorScreen extends Component {
                   label="Counter"
                   value={counter}
                   isValueValid={isCounterValid}
+                  minValue={1}
                   onValueChange={value => {
                     this.setState({
                       counter: value