refs swagger-api/swagger-codegen#9203 - fix spring boolean getter

Author: frantuma

src/main/java/io/swagger/codegen/v3/generators/java/SpringCodegen.java

@@ -720,10 +720,6 @@ public void setParameterExampleValue(CodegenParameter p) {
         }
     }
 
-    public String toBooleanGetter(String name) {
-        return getterAndSetterCapitalize(name);
-    }
-
     public void setTitle(String title) {
         this.title = title;
     }

src/main/resources/handlebars/JavaSpring/pojo.mustache

@@ -92,7 +92,7 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}} {{#seriali
   {{{vendorExtensions.extraAnnotation}}}
   {{/vendorExtensions.extraAnnotation}}
   @ApiModelProperty({{#example}}example = "{{{example}}}", {{/example}}{{#required}}required = {{required}}, {{/required}}{{#isReadOnly}}readOnly = {{{isReadOnly}}}, {{/isReadOnly}}value = "{{{description}}}")
-  {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{#isBoolean}}is{{/isBoolean}}{{getter}}() {
+  {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{getter}}() {
     return {{name}};
   }