fix: case insensitive search becomes case sensitive

src/controllers/searchReplace.js

@@ -450,6 +450,7 @@ const luckysheetSearchReplace = {
                                 }
                             }
                             else{
+                                if(caseCheck){
                                     if(~value.indexOf(searchText)){
                                         if(!((r + "_" + c) in obj)){
                                             obj[r + "_" + c] = 0;
@@ -457,6 +458,15 @@ const luckysheetSearchReplace = {
                                         }
                                     }
                                 }
+                                else{
+                                    if(~value.toLowerCase().indexOf(searchText.toLowerCase())){
+                                        if(!((r + "_" + c) in obj)){
+                                            obj[r + "_" + c] = 0;
+                                            arr.push({"r": r, "c": c});
+                                        }
+                                    }
+                                }
+                            }
                         }
                     }
                 }