update drag and drop prompt text to make it clear that ExifCleaner supports videos and PDFs as well

Author: szTheory

src/renderer/index.html

@@ -14,8 +14,8 @@
 					<div class="empty-icon">
 						<i class="icon icon-photo icon-3x"></i>
 					</div>
-					<p class="empty-title h5">No images selected</p>
-					<p class="empty-subtitle">Drag and drop files here for processing.</p>
+					<p class="empty-title h5">No files selected</p>
+					<p class="empty-subtitle">Drag and drop images, videos, or PDF files here for processing.</p>
 					<div class="empty-action"></div>
 				</div>
 			</div>