Searched word remains marked when search field is cleared

**Operating System**: Windows

**DocFX Version Used**: 2.59.4

**Template used**: default

**Steps to Reproduce**:
1. Search a word in DocFX.

2. Click into an article from search results.

**Expected Behavior**:
Searched word should have default background when search field is cleared. No additional space should be added before or after the searched word.

**Actual Behavior**:
Searched work remains marked when clicking into an article and search field is cleared and a space is added around the searched word. I.e, when I search for "file" as in the example, the word "files" in the article becomes "file s"