Style: clang-format: Disable KeepEmptyLinesAtTheStartOfBlocks

Which means that reduz' beloved style which we all became used to
will now be changed automatically to remove the first empty line.

This makes us lean closer to 1TBS (the one true brace style) instead
of hybridating it with some Allman-inspired spacing.

There's still the case of braces around single-statement blocks that
needs to be addressed (but clang-format can't help with that, but
clang-tidy may if we agree about it).

Part of #33027.

scene/2d/line_builder.cpp

@@ -117,7 +117,6 @@ void LineBuilder::clear_output() {
 }
 
 void LineBuilder::build() {
-
 	// Need at least 2 points to draw a line
 	if (points.size() < 2) {
 		clear_output();
@@ -220,7 +219,6 @@ void LineBuilder::build() {
 
 	// For each additional segment
 	for (int i = 1; i < len - 1; ++i) {
-
 		pos1 = points[i];
 		Vector2 pos2 = points[i + 1];
 
@@ -359,7 +357,6 @@ void LineBuilder::build() {
 
 		// Add joint geometry
 		if (current_joint_mode != Line2D::LINE_JOINT_SHARP) {
-
 			/* ________________ cbegin
 			 *               / \
 			 *              /   \
@@ -541,7 +538,6 @@ void LineBuilder::strip_add_tri(Vector2 up, Orientation orientation) {
 }
 
 void LineBuilder::strip_add_arc(Vector2 center, float angle_delta, Orientation orientation) {
-
 	// Take the two last vertices and extrude an arc made of triangles
 	// that all share one of the initial vertices
 
@@ -570,7 +566,6 @@ void LineBuilder::strip_add_arc(Vector2 center, float angle_delta, Orientation o
 }
 
 void LineBuilder::new_arc(Vector2 center, Vector2 vbegin, float angle_delta, Color color, Rect2 uv_rect) {
-
 	// Make a standalone arc that doesn't use existing vertices,
 	// with undistorted UVs from within a square section